Dog Eye Discharge: When to Worry and What to Do

You notice crusty gunk around your dog’s eye first thing in the morning. Is it normal sleep residue, or a sign something’s wrong? Your dog’s eye discharge offers critical clues about their health—from harmless tear staining to sight-threatening emergencies like glaucoma. The color, consistency, and accompanying symptoms tell you whether you can safely observe at home or need to rush to the emergency vet within hours.

Most dog owners will encounter eye discharge at some point. The challenge is distinguishing between normal tearstain buildup, manageable minor infections, and true emergencies that can cause permanent blindness in 24-48 hours. This guide teaches you to decode what your dog’s eyes are telling you, recognize emergency warning signs, and take appropriate action to protect their vision.

Understanding Normal vs Abnormal Eye Discharge

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Not all eye discharge warrants panic. Dogs naturally produce tears to lubricate and protect their eyes, and some accumulation is completely normal.

What’s Normal

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Small amount of clear discharge: Dogs produce tears continuously to maintain a healthy tear film over the cornea. This clear, watery fluid lubricates the eye, washes away debris, and delivers oxygen and nutrients to the cornea. You might notice a small amount of clear discharge in the inner corner of your dog’s eye, especially after sleep. This is normal.

Light brown or reddish crusty material: Many dogs, particularly those with white or light-colored fur, develop brownish or reddish crusty material around their eyes. This is tear staining, caused by porphyrins—naturally occurring molecules in tears that turn reddish-brown when exposed to air and sunlight. While cosmetically unappealing, tear staining is usually not a medical problem in itself, though excessive tearing that causes staining might signal an underlying issue like allergies, blocked tear ducts, or eye irritation.

The key characteristic of normal discharge is that it’s minimal, clear or light-colored, and doesn’t accompany other symptoms like squinting, redness, cloudiness, or behavioral changes.

What’s Abnormal

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Several types of discharge signal a problem requiring veterinary attention:

Yellow or green pus: Thick, opaque discharge that’s yellow, green, or yellow-green indicates a bacterial infection. The eye may be “glued shut” in the morning with this crusty material. This is conjunctivitis (pink eye) or another bacterial infection requiring antibiotic treatment. The pus is composed of white blood cells, bacteria, and dead tissue responding to infection.

Thick white or gray mucus: Ropy, thick mucus that accumulates in large amounts often signals dry eye (keratoconjunctivitis sicca or KCS). When dogs don’t produce enough tears, the eye compensates by producing excessive mucus, which becomes thick and stringy. Without the watery component of tears to flush things away, this mucus builds up significantly. Dry eye requires lifelong treatment to prevent blindness.

Excessive clear, watery discharge: While small amounts of clear tears are normal, profuse watering that keeps the fur around the eyes constantly wet suggests problems like allergies, blocked tear ducts preventing normal drainage, eye irritation, or even pain. Your dog is making normal or excess tears, but something is causing overproduction or preventing proper drainage.

Bloody discharge: Any blood coming from the eye is abnormal and potentially serious. It may indicate trauma, a corneal ulcer that’s eroded into blood vessels, severe infection, or glaucoma with dangerously elevated pressure. Bloody discharge demands immediate veterinary evaluation.

Discharge accompanied by other symptoms: Even if discharge looks relatively benign, it’s abnormal when paired with squinting, pawing at the eye, excessive blinking, redness of the whites of the eyes, cloudiness of the cornea, light sensitivity, or behavioral changes suggesting pain.

The Critical Color and Consistency Guide

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Your dog’s eye discharge color and consistency provide immediate diagnostic clues. Use this guide as your first assessment tool:

Clear and Watery (Excessive)

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What it means: Overproduction of the watery component of tears, or tears not draining properly.

Common causes:

• Allergies: Environmental allergens (pollen, dust, mold) or food sensitivities trigger histamine release, causing the eyes to water profusely. Both eyes usually affected equally.
• Blocked tear duct: The nasolacrimal duct normally drains tears from the eye into the nasal cavity. When blocked, tears overflow onto the face. Often affects one eye more than the other.
• Eye irritation: Foreign material (grass seed, dirt, eyelash, hair), smoke, chemical fumes, or physical trauma cause reflex tearing to flush out irritants.
• Corneal ulcer (early): Damage to the cornea’s surface initially triggers watering before infection sets in.
• Glaucoma (early): Elevated eye pressure can cause watering before other symptoms develop.

Action: If excessive clear tearing persists more than 24 hours, or is accompanied by squinting, redness, or behavioral changes, see your vet. If your dog otherwise seems comfortable and the discharge is the only symptom, you can monitor for 24-48 hours while ensuring no foreign object is present.

Yellow, Green, or Yellow-Green Pus

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What it means: Active bacterial infection. The immune system is fighting bacteria with white blood cells that form pus.

Common causes:

• Bacterial conjunctivitis: Infection of the conjunctiva (pink tissue lining the eyelids and covering the white of the eye). May start in one eye but often spreads to both.
• Infected corneal ulcer: An ulcer (scratch or defect in the cornea) that’s become infected with bacteria produces pus along with the ulcer’s pain symptoms.
• Secondary infection: Any other eye condition (dry eye, blocked duct, entropion) can develop a secondary bacterial infection that produces pus.

Action: Yellow or green pus requires veterinary treatment with antibiotic eye drops or ointment. Don’t wait more than 24 hours—bacterial infections worsen rapidly and can damage eye structures. Your vet will likely prescribe topical antibiotics like terramycin or gentamicin, applied 3-4 times daily for 7-10 days.

Thick White or Gray Mucus (Stringy, Ropy)

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What it means: Inadequate tear production, causing the eye to produce compensatory mucus without enough watery tears to flush it away.

Common cause:

• Dry eye (KCS - Keratoconjunctivitis Sicca): The lacrimal glands don’t produce sufficient tears. This is most commonly an immune-mediated condition where the body attacks its own tear glands. Certain breeds (Cocker Spaniels, Bulldogs, West Highland White Terriers, Lhasa Apsos) are predisposed. Some medications (sulfa drugs) can also cause it.

Action: Dry eye requires immediate veterinary diagnosis and lifelong treatment. Left untreated, it causes painful ulceration, pigmentation of the cornea, and blindness. Your vet will perform a Schirmer tear test (a small paper strip placed in the lower eyelid measures tear production over one minute). Normal is 15+ mm/minute; less than 10mm/minute confirms dry eye. Treatment typically involves cyclosporine (Optimmune) or tacrolimus drops twice daily to stimulate tear production and suppress the immune attack on tear glands.

Brown or Red Crusty Material

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What it means: Tear staining from porphyrins in tears.

Common causes:

• Tear staining: Usually a cosmetic issue in light-colored dogs. Porphyrins are naturally occurring molecules excreted in tears, saliva, and urine. When tears sit on fur, porphyrins oxidize and turn reddish-brown.
• Excessive tearing: While staining itself is harmless, the excessive tearing causing it might signal an underlying problem like allergies, shallow eye sockets in flat-faced breeds, hair irritating the eye, or blocked tear ducts.

Action: If the brown/red material is just dried crusty staining and your dog shows no other symptoms, this is typically cosmetic. Clean the area gently with warm water daily. If excessive fresh tears are constantly present, causing perpetual wetness and staining, see your vet to identify why tear production is elevated or drainage is blocked.

Bloody Discharge

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What it means: Blood from the eye or surrounding structures—always abnormal.

Common causes:

• Eye trauma: Scratch from a cat claw, collision, blunt trauma can rupture blood vessels in the conjunctiva, sclera, or within the eye.
• Severe corneal ulcer: Deep ulcers can erode into blood vessels in the cornea.
• Glaucoma: Dangerously elevated pressure can rupture vessels or cause bleeding inside the eye.
• Bleeding disorder: Rarely, systemic clotting problems manifest as bleeding from mucous membranes including the eye.
• Tumors: Growths on the eyelid or within the eye can bleed.

Action: Bloody discharge is always an emergency. See your vet or emergency vet immediately. Even small amounts of blood indicate significant damage that could worsen rapidly and threaten vision.

Most Common Causes of Dog Eye Discharge

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Understanding the underlying conditions helps you recognize patterns and take appropriate action.

1. Conjunctivitis (Pink Eye)

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Conjunctivitis is inflammation or infection of the conjunctiva—the pink tissue lining the inside of the eyelids and covering the white part of the eye (sclera). It’s the most common cause of eye discharge in dogs.

Types:

• Bacterial conjunctivitis: Infection with bacteria like Staphylococcus or Streptococcus produces yellow-green pus, redness, and squinting. May affect one or both eyes. Can result from primary infection or secondary to another condition like dry eye or allergies.
• Viral conjunctivitis: Viruses like canine distemper virus or canine herpesvirus cause conjunctivitis, typically with clear or mucoid discharge, redness, and sometimes systemic illness. More common in young, unvaccinated dogs or those in kennel environments.
• Allergic conjunctivitis: Allergens trigger histamine release causing redness, swelling, and clear watery discharge. Both eyes affected equally. Often seasonal or related to specific exposures.

Symptoms:

• Red, inflamed conjunctiva
• Discharge (clear, mucoid, or purulent depending on type)
• Squinting or holding eye partially closed
• Rubbing or pawing at eye
• Swollen eyelids
• Both eyes often affected (though may start in one)

Diagnosis: Your vet examines the eye, checks for underlying causes like foreign bodies or eyelid abnormalities, and may take a culture if bacterial infection is suspected.

Treatment:

• Bacterial: Topical antibiotic drops or ointment (terramycin, gentamicin, neomycin-polymyxin) 3-4 times daily for 7-10 days.
• Viral: Supportive care, keeping eyes clean, sometimes antiviral medications for herpesvirus.
• Allergic: Remove allergen if possible, antihistamine oral medications (Benadryl), cool compresses, sometimes short-term steroid drops if severe.

Prognosis: Most cases resolve completely with treatment. Chronic or recurrent conjunctivitis warrants investigation for underlying causes.

2. Dry Eye (Keratoconjunctivitis Sicca - KCS)

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Dry eye occurs when the lacrimal glands don’t produce adequate tears, leaving the cornea dry and vulnerable. The eye compensates by producing thick mucus, which accumulates since there’s not enough watery tears to flush it away.

Causes:

• Immune-mediated: The most common cause. The immune system mistakenly attacks and destroys tear glands. Genetic predisposition in certain breeds.
• Medications: Sulfa drugs (sulfasalazine, sulfadiazine) used for other conditions can cause KCS.
• Congenital: Some dogs are born with inadequate tear gland function.
• Nerve damage: Trauma or surgery affecting facial nerves that stimulate tear production.
• Chronic conjunctivitis: Long-term inflammation can damage tear glands.

Symptoms:

• Thick, ropy, white or yellow-green mucus discharge
• Dull, dry appearance to cornea (should look shiny and moist)
• Redness and inflammation
• Squinting and light sensitivity
• Pawing at eyes
• Corneal pigmentation (brown discoloration) over time
• Corneal ulceration if untreated
• Both eyes often affected, though severity may differ

Diagnosis: The Schirmer tear test is diagnostic. A small strip of special paper is placed in the lower eyelid for exactly one minute to measure tear production.

• Normal: 15+ mm of wetting in 1 minute
• Borderline: 11-14 mm/minute
• Dry eye: Less than 10 mm/minute
• Severe dry eye: Less than 5 mm/minute

Your vet will also examine the cornea for ulceration or pigmentation and check for underlying causes.

Treatment:

• Cyclosporine (Optimmune): The gold standard. This immunosuppressive medication applied as drops twice daily suppresses the immune attack on tear glands and stimulates tear production. It takes 3-6 weeks to see improvement. Lifelong treatment required. Success rate: 70-80% of dogs show significant improvement.
• Tacrolimus: An alternative immunosuppressive drop, often more effective but more expensive. Used when cyclosporine doesn’t work or only partially improves tear production.
• Artificial tears: Lubricating drops applied frequently (every 2-4 hours) provide temporary moisture and comfort. These supplement but don’t replace the above treatments.
• Surgery (rare): Parotid duct transposition surgically redirects a salivary gland duct to the eye. Reserved for severe cases unresponsive to medication.

Prognosis: With consistent treatment, most dogs maintain comfortable vision. Without treatment, KCS leads to painful ulceration, pigmentation that obscures vision, and blindness. Lifelong daily medication is essential.

3. Corneal Ulcer

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A corneal ulcer is a defect or erosion in the cornea—the clear outer surface of the eye. The cornea has no blood vessels (so it stays transparent) and heals slowly. Ulcers are painful and can rapidly worsen if infected.

Causes:

• Trauma: Scratches from cat claws, running through brush, foreign objects (grass seeds, sand)
• Self-trauma: Dogs rubbing painful eyes can create ulcers
• Dry eye: Inadequate tears leave cornea vulnerable to ulceration
• Entropion: Eyelid rolling inward causes lashes/fur to constantly scratch cornea
• Foreign material: Embedded seeds, plant awns, or debris
• Chemical burns: Exposure to caustic substances
• Infections: Viral or bacterial infections can directly damage cornea

Symptoms:

• Severe squinting: Blepharospasm (forceful closing of eyelids) is the hallmark symptom
• Clear watery discharge initially, may become pus-like if infected
• Pawing at the eye
• Extreme light sensitivity (photophobia)
• Redness and inflammation
• Cloudiness of cornea where ulcer is located
• Third eyelid (nictitating membrane) may protrude to protect eye

Diagnosis: Your vet applies fluorescein stain—a bright orange-green dye—to the eye. Healthy cornea repels the stain, but ulcerated areas absorb it and glow bright green under a blue light. This clearly shows the ulcer’s location and size.

Treatment:

• Antibiotic drops: Prevent or treat bacterial infection (prescribed based on severity: simple ulcers use neomycin-polymyxin or terramycin; deeper or infected ulcers need stronger antibiotics like ofloxacin or ciprofloxacin). Applied 4-6 times daily.
• Atropine drops: Dilate the pupil and reduce pain by preventing painful ciliary muscle spasms. Applied 1-3 times daily depending on pain level.
• Pain medication: Oral pain relief (tramadol, gabapentin) for moderate to severe ulcers.
• E-collar (cone): Absolutely essential to prevent self-trauma. Dogs must wear it 24/7 until the ulcer heals.
• Surgery: Deep or non-healing ulcers may require surgical intervention like a conjunctival graft to provide blood supply for healing.

Follow-up: Recheck exams with repeat fluorescein staining every 3-7 days to monitor healing. Simple ulcers typically heal in 5-7 days. Complicated or deep ulcers take longer.

Prognosis: Most simple ulcers heal completely with treatment. Complicated ulcers, deep ulcers, or infected ulcers risk permanent corneal scarring that can affect vision. Perforation of the cornea is a surgical emergency.

4. Glaucoma

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Glaucoma is elevated pressure inside the eye. It’s a true emergency that causes excruciating pain and can lead to permanent blindness within 24-48 hours if untreated. Glaucoma happens when the fluid inside the eye (aqueous humor) doesn’t drain properly, building up pressure.

Types:

• Primary glaucoma: Genetic predisposition with abnormal drainage angle structure. Certain breeds are at high risk: Cocker Spaniels, Basset Hounds, Chow Chows, Shar Peis, Siberian Huskies, Beagles. Often starts in one eye then develops in the other eye months to years later.
• Secondary glaucoma: Results from another eye condition blocking drainage: lens luxation (lens falls out of place), uveitis (inflammation inside eye), tumors, or advanced cataracts.

Symptoms:

• Cloudy, bluish appearance to cornea (corneal edema from high pressure)
• Dilated pupil that doesn’t respond to light
• Red eye from engorged blood vessels
• Eye may appear larger (buphthalmos - enlarged eye from chronic high pressure)
• Severe pain: Squinting, rubbing, hiding, loss of appetite, lethargy
• Vision loss: Bumping into objects, reluctance to move
• Discharge: May have clear or slightly cloudy discharge

Diagnosis: Your vet measures intraocular pressure (IOP) with a tonometer.

• Normal: 10-20 mmHg
• Elevated: 25-30 mmHg
• Glaucoma: 30+ mmHg (often 40-70 mmHg in acute attacks)

Your vet will also examine for underlying causes and assess optic nerve damage.

Treatment: Glaucoma treatment aims to lower pressure, preserve vision if possible, and manage pain. This is an EMERGENCY requiring immediate treatment.

Medical management (if vision present):

• Topical medications: Latanoprost (increases drainage), dorzolamide (decreases fluid production), timolol (decreases production). Usually combination therapy. Applied 2-4 times daily lifelong.
• Oral medications: Methazolamide (decreases fluid production). Given twice daily.
• Emergency pressure reduction: IV mannitol in hospital to rapidly reduce pressure.

Surgical options:

• Laser surgery: Cyclophotocoagulation destroys some of the ciliary body (which produces aqueous humor) to reduce fluid production. May preserve vision in some cases.
• Drainage implants: Surgical devices that help fluid drain.
• Enucleation (eye removal): If the eye is blind and painful, removing it is the most humane option to eliminate suffering.
• Intrascleral prosthesis: Remove inner eye contents but keep the outer shell, placing a prosthetic inside for cosmetic appearance.

Prognosis: If treated within 12-24 hours of acute glaucoma onset, there’s a chance of preserving some vision. After 48 hours, blindness is usually irreversible. Even with treatment, most dogs with primary glaucoma eventually lose vision as the disease progresses. The goal becomes managing pressure to keep the dog comfortable. Dogs with blind, painful eyes often require enucleation for humane reasons. Dogs with secondary glaucoma have better chances of vision preservation if the underlying cause can be treated.

5. Blocked Tear Duct (Nasolacrimal Duct Obstruction)

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Tears normally drain from the eye through tiny openings (puncta) in the inner corner of upper and lower eyelids, flowing through the nasolacrimal duct into the nasal cavity (which is why your nose runs when you cry). When this drainage system is blocked, tears overflow onto the face.

Causes:

• Congenital: Born with abnormally small or malformed ducts (common in brachycephalic breeds)
• Infection/inflammation: Swelling can close the duct
• Foreign material: Grass seeds or debris blocking the duct
• Trauma or scarring: Damage to duct openings or the duct itself
• Tumors: Growths compressing or blocking the duct

Symptoms:

• Excessive clear watering from one or both eyes
• Tears constantly running down face
• Brown staining on face (from porphyrins in tears)
• Wetness of fur below eyes
• Otherwise normal-appearing eye (no redness, no squinting)

Diagnosis: Your vet can flush the nasolacrimal duct under sedation or anesthesia, introducing saline into the duct opening in the corner of the eye. If the duct is open, saline flows out the nostril. If blocked, it doesn’t flow or comes back out the eye.

Treatment:

• Duct flushing: Often resolves blockages from debris or mucus plugs
• Antibiotics: If infection is causing inflammation and blockage
• Surgery: For congenital malformations or scarring, surgical creation of a new drainage opening may be needed

Prognosis: Many cases resolve with flushing and treatment of underlying infection. Congenital issues may require lifelong management.

6. Entropion

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Entropion is a condition where the eyelid rolls inward, causing eyelashes and fur to rub constantly against the cornea and conjunctiva. This creates chronic irritation, pain, discharge, and often leads to corneal ulceration.

Causes:

• Congenital: Genetic predisposition with abnormal eyelid structure. Common in Shar Peis, Chow Chows, Bulldogs, Mastiffs, Rottweilers, Great Danes.
• Acquired: Chronic eye pain and inflammation can cause spasms that pull eyelid inward (spastic entropion)

Symptoms:

• Clear discharge that may become mucoid or purulent
• Squinting and light sensitivity
• Redness
• Corneal cloudiness or ulceration
• Pawing at eye
• Visible inward rolling of eyelid (usually lower lid, sometimes upper)

Diagnosis: Physical examination clearly shows the eyelid rolling inward. Your vet will also check for secondary corneal damage with fluorescein staining.

Treatment:

• Temporary tacking: In young puppies with mild entropion, the vet may place temporary sutures to roll the lid outward, allowing time for facial structure to mature. Some puppies grow out of it.
• Surgical correction: Definitive treatment removes a small wedge of skin and/or eyelid tissue to permanently roll the lid to normal position. Success rate is high. This is elective surgery performed once the puppy is fully grown (around 1 year old) unless the condition is severe and causing ulceration.

Prognosis: Excellent with surgical correction. Without correction, chronic ulceration leads to corneal scarring and vision loss.

7. Cherry Eye (Prolapsed Third Eyelid Gland)

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Dogs have a third eyelid (nictitating membrane) in the inner corner of the eye with an important tear-producing gland at its base. Cherry eye occurs when the tissue holding this gland in place weakens, and the gland prolapses (pops out), appearing as a red, cherry-like mass in the corner of the eye.

Causes:

• Genetic predisposition: Breed-related weakness in the connective tissue anchoring the gland. Common in English Bulldogs, American Cocker Spaniels, Beagles, Boston Terriers, Lhasa Apsos, Shih Tzus. Usually occurs in dogs under 2 years old.

Symptoms:

• Red or pink mass protruding from inner corner of eye
• Clear or mucoid discharge
• Mild irritation (rubbing, squinting)
• May come and go initially, then stays prolapsed
• Can affect one or both eyes (often starts in one, later develops in the other)

Diagnosis: Appearance is distinctive and diagnosis is made by physical examination.

Treatment:

• Surgical replacement: The gold standard is surgery to tuck the gland back into position and suture it in place. This preserves the gland’s tear production, which is important since Bulldogs and Cocker Spaniels are already prone to dry eye. Multiple surgical techniques exist; success rates vary by technique (60-90% depending on method and surgeon experience).
• Gland removal (NOT recommended): Older approach that removes the prolapsed gland. This significantly increases risk of dry eye later in life since the gland produces up to 40% of the eye’s tears. Only considered if multiple replacement surgeries fail or if the gland is severely damaged.

Prognosis: Good with surgical replacement. Dogs with cherry eye in one eye have 25-50% chance of developing it in the other eye later.

8. Allergies

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Environmental or food allergies can cause eye symptoms in dogs just as they do in humans.

Common allergens:

• Environmental: Pollen, mold, dust mites, grass
• Food: Beef, chicken, dairy, wheat, soy (less commonly cause isolated eye symptoms without skin/GI signs)

Symptoms:

• Clear, watery discharge from both eyes
• Red, mildly swollen conjunctiva
• Itching (rubbing face on furniture, pawing at face)
• Often accompanied by other allergy signs: itchy skin, ear infections, paw licking, GI upset

Diagnosis: Based on symptoms, seasonality, and response to treatment. Allergy testing (blood test or intradermal skin testing) can identify specific allergens.

Treatment:

• Remove allergen: If possible (change food, reduce outdoor time during high pollen)
• Antihistamines: Benadryl (diphenhydramine) 1mg per pound body weight every 8-12 hours, or Zyrtec (cetirizine), or Claritin (loratadine)
• Omega-3 fatty acids: Fish oil supplements reduce inflammation
• Cool compresses: Provide soothing relief
• Steroid drops: For severe cases, short-term use (long-term steroids in eyes risk glaucoma and cataract formation)
• Immunotherapy: For severe environmental allergies, allergen-specific immunotherapy (allergy shots) can desensitize the immune system

Prognosis: Allergies are typically a lifelong management issue but can be controlled with treatment.

Emergency Signs: When to See a Vet Immediately

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Some eye conditions progress rapidly and threaten vision within hours to days. Recognize these emergency signs that require immediate veterinary or emergency vet care:

1. Glaucoma Signs

• Cloudy, bluish cornea
• Dilated pupil not responding to light
• Extremely red eye
• Obvious pain (squinting, hiding, not eating)
• Vision loss
• Eye appears larger than normal

Urgency: Within 12-24 hours of symptom onset, preferably sooner. Every hour counts.

2. Signs of Corneal Ulcer

• Severe squinting (forcefully holding eye closed)
• Excessive clear tearing
• Extreme light sensitivity
• Pawing at eye
• Cloudiness on cornea surface

Urgency: Same day. Ulcers can rapidly worsen, become infected, or perforate.

3. Eye Trauma

• Visible injury to eye
• Blood coming from eye
• Eye protruding from socket (proptosis)
• Penetrating injury (something stuck in eye)
• Chemical exposure

Urgency: IMMEDIATE. Do not wait.

4. Sudden Vision Loss

• Bumping into objects
• Reluctance to move
• Disorientation

Urgency: Immediate to same-day depending on other symptoms.

5. Thick Pus Discharge with Severe Symptoms

• Heavy yellow-green pus AND severe pain/squinting/cloudiness
• Signs of systemic illness (fever, lethargy, not eating)

Urgency: Same day to within 24 hours.

When You Can Wait for a Regular Appointment (24-48 hours):

• Mild conjunctivitis with light discharge, mild redness, but dog is comfortable
• Tear staining without other symptoms
• Mild clear discharge that’s been present less than 24 hours with no other symptoms
• Cherry eye in a young dog (not painful, just cosmetic - can schedule surgery but not emergent)

When You Can Monitor at Home:

• Very small amount of clear discharge in morning that you can wipe away
• Mild tear staining with no excessive fresh tearing
• Dog otherwise acting completely normal, no pain behaviors

However, if ANY home-monitored condition doesn’t improve in 24-48 hours or worsens, see your vet.

Diagnostic Tests Your Vet Will Perform

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Understanding what tests to expect helps you prepare and ensures thorough evaluation.

1. Schirmer Tear Test

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What it measures: Tear production How it works: A small strip of special filter paper with a notch is placed over the lower eyelid into the eye. The test runs for exactly 60 seconds. Tears wick up the paper strip, and the wetting distance is measured in millimeters. Normal values: 15+ mm/minute Interpretation:

• 11-14 mm: Low-normal, monitor
• 5-10 mm: Dry eye, treatment needed
• <5 mm: Severe dry eye, aggressive treatment needed

When performed: If your vet suspects dry eye based on thick mucus discharge, dry appearance to cornea, or breed predisposition.

2. Fluorescein Stain Test

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What it detects: Corneal ulcers How it works: A fluorescent orange-green dye (fluorescein) is applied to the eye. Healthy corneal epithelium repels the stain, but areas where the epithelium is damaged (ulcers) absorb it. A blue light makes the stain glow bright green, clearly outlining any ulcers. Interpretation: Any bright green stain uptake indicates an ulcer. The pattern and depth give information about severity.

When performed: If your vet suspects a corneal ulcer based on severe squinting, cloudiness, or history of trauma. Often performed for any painful eye.

3. Tonometry (Intraocular Pressure Measurement)

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What it measures: Pressure inside the eye How it works: A tonometer gently touches the cornea (after numbing drops) or uses a puff of air to measure the resistance, calculating internal eye pressure. Normal values: 10-20 mmHg Interpretation:

• <10 mmHg: Low pressure (uveitis, retinal detachment)
• 25-30 mmHg: Elevated, concerning for glaucoma
• 30+ mmHg: Glaucoma, requires immediate treatment

When performed: If your vet suspects glaucoma (cloudy eye, dilated pupil, severe pain, red eye) or uveitis.

4. Ophthalmic Examination

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What it involves: Detailed examination of all eye structures using specialized equipment:

• Penlight or focal light: Examines external structures, checks pupil responses
• Direct ophthalmoscope: Views back of eye (retina, optic nerve, blood vessels)
• Slit lamp biomicroscope: Provides magnified view of cornea, anterior chamber, lens (available at veterinary ophthalmologists)

What it detects: Eyelid abnormalities (entropion, masses), conjunctival inflammation, foreign bodies, corneal clarity, lens clarity (cataracts), signs of uveitis, retinal disease, optic nerve health.

When performed: Part of every eye problem examination.

5. Culture and Sensitivity

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What it detects: Specific bacteria causing infection and which antibiotics will be effective How it works: Your vet takes a sample of discharge with a sterile swab and sends it to a lab. The lab grows any bacteria present and tests various antibiotics to see which ones kill the bacteria. When performed: For severe infections, infections not responding to initial antibiotic treatment, or chronic/recurrent infections.

6. Advanced Tests (Usually Performed by Veterinary Ophthalmologists)

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• Gonioscopy: Examines the drainage angle to diagnose the type of glaucoma
• Ultrasound: Examines structures inside the eye when the cornea is too cloudy to see through
• Electroretinogram (ERG): Tests retinal function
• Tear film break-up time: Evaluates tear film quality in addition to quantity

At-Home First Aid for Mild Eye Discharge

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For very mild cases where your dog is otherwise comfortable and you’re monitoring before deciding on vet care, you can provide supportive care at home. However, if symptoms worsen or don’t improve in 24 hours, see your vet.

When Home Care Is Appropriate

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• Very small amount of clear or light mucoid discharge
• No squinting or obvious pain
• No redness or mild redness only
• No cloudiness of cornea
• Dog acting normally
• Discharge is the ONLY symptom

When NOT to treat at home:

• Yellow or green pus
• Severe squinting
• Cloudiness of cornea
• Pupil abnormalities
• Obvious pain
• Vision problems
• Doesn’t improve in 24 hours

Warm Compress Technique

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Warm compresses can soothe mild irritation and help loosen crusty discharge.

1. Prepare compress: Soak a clean, soft washcloth in warm (not hot) water. Test temperature on your wrist—should be comfortably warm.
2. Apply gently: Hold the warm, damp cloth against your dog’s closed eye for 5-10 minutes. Don’t apply pressure, just rest it gently against the eye.
3. Repeat: Do this 2-3 times daily.
4. Clean cloth each time: Use a freshly laundered cloth each time to avoid introducing bacteria.

Cleaning Around the Eye

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Supplies:

• Sterile saline solution (NOT contact lens solution with preservatives—use sterile saline made for wound irrigation) or boiled and cooled water
• Soft gauze pads or clean cotton balls (not tissue or paper towels which are too rough)

Technique:

1. Soak gauze or cotton ball in saline or cooled boiled water
2. Gently wipe from inner corner of eye outward, removing crusty discharge
3. Use a fresh gauze/cotton ball for each wipe to avoid spreading bacteria
4. Never wipe across the eyeball itself—only clean the fur and skin around the eye
5. Pat dry with clean gauze
6. Do this 2-3 times daily

Sterile Saline Rinse

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You can use sterile saline to gently rinse the eye surface if you suspect mild irritation from dust or debris.

1. Hold your dog’s head steady and gently open the eyelids
2. Squirt or pour sterile saline across the eye surface from inner to outer corner
3. Let it flush out naturally—don’t wipe while rinsing
4. Pat dry around (not on) the eye when done

E-Collar for Self-Trauma Prevention

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If your dog is pawing or rubbing at the eye, preventing self-trauma is critical.

Use an Elizabethan collar (e-collar/cone) or inflatable collar to prevent your dog from rubbing or scratching the eye until you can see your vet. Even mild irritation can become a serious ulcer if your dog traumatizes it.

What NOT to Do

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• Don’t use human eye drops: Over-the-counter drops made for humans may contain ingredients harmful to dogs or that mask symptoms you need to observe
• Don’t use old prescription eye medications: Medications prescribed for previous eye issues may be wrong or even dangerous for the current problem (for example, steroid drops are dangerous for corneal ulcers)
• Don’t delay: If your dog is squinting, has pus discharge, or shows pain—see your vet. Home care is only for the mildest cases while you monitor

Veterinary Treatments by Condition

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Understanding what treatments your vet might prescribe helps you know what to expect.

For Bacterial Conjunctivitis

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Topical antibiotics:

• Terramycin (oxytetracycline + polymyxin B): Broad-spectrum antibiotic ointment, applied 3-4 times daily for 7-10 days
• Gentamicin drops or ointment: Applied 3-4 times daily
• Neomycin-polymyxin-bacitracin (Neo-Poly-Bac): Triple antibiotic, 3-4 times daily
• Ofloxacin or ciprofloxacin: Fluoroquinolone antibiotics for resistant infections, 3-4 times daily

Application tips:

• Wash hands before and after
• Gently pull down lower eyelid to create a small pocket
• Apply a thin ribbon of ointment or 1-2 drops of liquid into this pocket
• Let your dog blink to distribute medication
• Don’t let the tube/dropper tip touch the eye

Follow-up: Recheck in 5-7 days if not improving, or 10-14 days to confirm resolution.

For Dry Eye (KCS)

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Cyclosporine (Optimmune):

• 0.2% ointment applied to each affected eye every 12 hours (twice daily)
• Stimulates tear production and suppresses immune-mediated destruction of tear glands
• Takes 3-6 weeks to see results—don’t stop if it doesn’t work immediately
• Lifelong treatment required
• Cost: Moderate ($50-80/month for both eyes)

Tacrolimus:

• Compounded as 0.02-0.03% ointment, applied twice daily
• Alternative or addition to cyclosporine for dogs who don’t respond adequately
• Often more effective but more expensive
• Cost: Higher ($100-150/month)

Artificial tears:

• Lubricating drops applied frequently (every 2-4 hours) for immediate moisture and comfort
• Supplements but doesn’t replace immunosuppressive treatment
• Use preservative-free formulations for frequent application

Follow-up: Recheck with Schirmer tear test in 3-6 weeks, then every 3-6 months lifelong to monitor tear production.

For Corneal Ulcers

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Antibiotic drops/ointment:

• Simple ulcers: Neomycin-polymyxin, terramycin, or gentamicin, applied 4-6 times daily
• Infected or complicated ulcers: Ofloxacin or ciprofloxacin, applied every 4-6 hours (including overnight initially)

Atropine drops:

• 1% atropine applied 1-3 times daily to dilate pupil and reduce pain
• Reduces painful ciliary muscle spasms
• Your dog’s pupil will be dilated (light sensitivity) and they’ll have difficulty focusing

Oral pain medication:

• Tramadol, gabapentin, or carprofen for moderate to severe pain

E-collar:

• Absolutely mandatory 24/7 until ulcer heals
• Dogs will instinctively rub painful eyes, causing further damage

Follow-up: Recheck with fluorescein staining every 3-7 days until healed. Simple ulcers heal in 5-7 days. If not healing by day 7, further workup needed.

For Glaucoma

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Emergency treatment in hospital:

• IV mannitol: Rapidly reduces intraocular pressure
• Topical medications: Started immediately

Long-term topical medications (if vision present):

• Latanoprost (Xalatan): Increases aqueous humor drainage, applied twice daily
• Dorzolamide (Trusopt) or brinzolamide (Azopt): Decreases aqueous humor production, applied 2-3 times daily
• Timolol: Beta-blocker that decreases production, applied twice daily
• Often used in combination

Oral medication:

• Methazolamide: Decreases aqueous production, given every 8-12 hours

Surgical options:

• Laser cyclophotocoagulation: Destroys part of ciliary body to decrease fluid production
• Drainage implants: Surgical devices to improve drainage
• Enucleation: Remove painful blind eye
• Intrascleral prosthesis: Remove internal eye contents, place prosthetic sphere for cosmetic appearance

Follow-up: Frequent rechecks with tonometry to monitor pressure control. Most dogs with primary glaucoma eventually lose vision despite treatment.

For Allergies

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Antihistamines:

• Benadryl (diphenhydramine): 1 mg per pound every 8-12 hours
• Zyrtec (cetirizine): 0.5 mg per pound once daily
• Claritin (loratadine): 0.2 mg per pound once to twice daily

Omega-3 fatty acids:

Reduces inflammation, supports tear film quality and skin health. Give 20-55 mg EPA/DHA per pound body weight daily.

Topical steroids (short-term only):

• Prednisolone acetate or dexamethasone drops for severe allergic conjunctivitis
• Used SHORT-TERM only due to risk of glaucoma and cataract with long-term use
• Never used if corneal ulcer present—steroids worsen ulcers

Immunotherapy:

• For severe environmental allergies, allergen-specific immunotherapy injections can desensitize immune system
• Requires allergy testing first
• Takes 6-12 months to see results
• Success rate around 60-70%

Body Clues Your Dog Shows: Recognizing Eye Problems

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Dogs can’t tell you their eye hurts, but they show specific behavioral and physical signs that something is wrong. Learning to recognize these body clues helps you catch problems early.

Signs of Eye Pain or Discomfort

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Squinting (Blepharospasm): The most reliable sign of eye pain is squinting—holding the affected eye partially or fully closed. Mild squinting looks like your dog is winking or has a sleepy eye. Severe squinting means the eye is forcefully clamped shut. Squinting indicates corneal pain (ulcer, foreign body, severe dry eye) or intraocular pain (glaucoma, uveitis).

Pawing or Rubbing at the Eye: Dogs with itchy or painful eyes try to relieve discomfort by pawing at their face or rubbing their face on furniture, carpet, or the ground. This behavior is dangerous because it can create corneal ulcers or worsen existing ones. If you see this, prevent it with an e-collar immediately.

Light Sensitivity (Photophobia): Dogs with painful eyes avoid bright light. You might notice your dog seeking dark areas, keeping eyes closed in sunlight, or avoiding well-lit rooms. Corneal ulcers and uveitis cause significant light sensitivity.

Excessive Tearing: If tears are constantly running down your dog’s face, creating wetness and staining, something is causing either tear overproduction (pain, irritation, allergies) or blocked drainage. Either way, it’s abnormal and warrants investigation.

Third Eyelid Visible: Dogs have a third eyelid (nictitating membrane) that normally stays hidden in the inner corner of the eye. When the eye is painful or inflamed, this third eyelid may protrude partially or fully across the eye as a protective mechanism. While sometimes a transient finding, persistent third eyelid protrusion indicates a problem.

Behavioral Changes:

• Lethargy or depression: Severe eye pain affects overall behavior
• Loss of appetite: Dogs in significant pain may not want to eat
• Hiding or seeking comfort: Pain drives dogs to isolate or seek more attention
• Reluctance to play: Especially if play involves bright light or running (which jostle painful eyes)
• Head shyness: Not wanting you to touch their head/face

Signs of Vision Loss

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Bumping into Objects: Dogs with suddenly decreased vision bump into furniture, walls, or door frames, especially in unfamiliar environments or when furniture has been moved. They may navigate familiar spaces reasonably well by memory.

Reluctance to Move: Blind or vision-impaired dogs often become hesitant to walk, especially in new areas. They may stand still, move very slowly, or refuse to go down stairs.

Dilated Pupils: Pupils that stay dilated even in bright light can indicate vision loss, glaucoma, or retinal problems.

Lack of Tracking: A dog with good vision tracks movement—their eyes follow your hand moving, a ball rolling, etc. Loss of this tracking response suggests vision problems.

Disorientation: Vision-impaired dogs may seem confused about where they are or have difficulty finding their food bowl, bed, or door.

Physical Signs on the Eye Itself

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Redness: The white part of the eye (sclera) and the inner lining of the eyelids (conjunctiva) turn red or pink with inflammation, infection, or elevated pressure. Mild redness might be subtle; severe redness is obvious bright red tissue.

Cloudiness: Any loss of clarity or transparency of the cornea is abnormal:

• White or gray cloudiness: Corneal edema (fluid swelling) from ulcer, glaucoma, or endothelial dysfunction
• Bluish cloudiness: Corneal edema from glaucoma
• Brown or black pigmentation: Chronic irritation (dry eye, entropion) causes melanin deposition on cornea
• White opacity inside eye: Cataract (lens opacification)

Discharge (Already Covered in Color Guide): Any discharge beyond minimal clear tears is abnormal.

Pupil Size Abnormalities:

• One pupil larger than the other (anisocoria): Glaucoma, uveitis, or neurologic problems
• Non-responsive pupil: Doesn’t constrict in light—vision loss, glaucoma, or severe eye disease

Eye Size Abnormalities:

• Enlarged eye (buphthalmos): Chronic glaucoma stretches and enlarges the eyeball
• Sunken eye (enophthalmos): Pain causes eye to retract into the socket, or indicates dehydration, weight loss, or loss of fat behind the eye

Prolapsed Eye (Proptosis): The eye pops forward out of the socket, usually from blunt trauma to the head. This is an EMERGENCY requiring immediate veterinary care.

Breed Predispositions to Eye Problems

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Certain breeds are genetically predisposed to specific eye conditions. If you have one of these breeds, be particularly vigilant.

Brachycephalic Breeds (Flat-Faced Dogs)

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Breeds: Pugs, Bulldogs (English and French), Boston Terriers, Pekingese, Shih Tzus, Boxers

Eye problems:

• Prominent eyes: Shallow eye sockets mean eyes protrude, making them vulnerable to trauma and proptosis (eye popping out)
• Corneal ulcers: Prominent eyes are easily scratched; some have facial folds that rub the eye; may have poor tear distribution
• Pigmentary keratitis: Chronic irritation causes brown pigmentation on cornea, obscuring vision
• Tear duct abnormalities: Shallow skulls create kinked or compressed tear ducts, leading to overflow tearing and staining
• Entropion: Particularly of medial lower eyelid

What to watch for: Any squinting, discharge, or cloudiness. Protect eyes during play with other dogs. Keep facial folds clean.

Cocker Spaniels

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Eye problems:

• Dry eye (KCS): One of the most predisposed breeds to immune-mediated dry eye
• Cherry eye: Prolapsed gland of third eyelid, usually occurs in young dogs
• Glaucoma: Predisposed to primary glaucoma
• Cataracts: High incidence, often hereditary
• Progressive retinal atrophy (PRA): Inherited degenerative retinal disease leading to blindness

What to watch for: Thick mucus discharge (dry eye), red mass in corner of eye (cherry eye), cloudy lens (cataract), night blindness (PRA).

Poodles (All Sizes)

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Eye problems:

• Tear staining: Light-colored Poodles commonly show reddish-brown staining
• Progressive retinal atrophy (PRA): Hereditary retinal degeneration causing blindness
• Cataracts: Both hereditary and age-related
• Glaucoma: Predisposed to primary glaucoma

What to watch for: Night blindness progressing to total blindness (PRA), cloudiness inside eye (cataract), painful red eye with cloudy cornea (glaucoma).

Shar Peis and Chow Chows

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Eye problems:

• Entropion: Extremely common due to excessive skin folds. Often affects multiple eyelids. May require multiple corrective surgeries.
• Glaucoma: Predisposed to narrow-angle glaucoma

What to watch for: Squinting and discharge from very young age (entropion), painful cloudy red eye (glaucoma).

Yorkshire Terriers

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Eye problems:

• Dry eye (KCS): High predisposition
• Cataracts: Common with aging
• Retinal dysplasia: Congenital abnormal retinal development

What to watch for: Thick mucus discharge (dry eye), cloudiness inside eye (cataract).

Siberian Huskies and Malamutes

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Eye problems:

• Glaucoma: High incidence of primary glaucoma
• Corneal dystrophy: Inherited accumulation of lipid in cornea
• Progressive retinal atrophy (PRA): Hereditary blindness
• Cataracts: Both hereditary and age-related

What to watch for: Painful cloudy red eye (glaucoma), white spots on cornea (dystrophy), night blindness (PRA).

Basset Hounds

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Eye problems:

• Glaucoma: Very high predisposition to primary glaucoma
• Cherry eye: Prolapsed gland of third eyelid
• Ectropion: Eyelid rolls outward (opposite of entropion), exposing conjunctiva and causing chronic irritation

What to watch for: Painful cloudy eye (glaucoma), red mass in corner (cherry eye), chronic redness and discharge (ectropion).

Tear Staining in White and Light-Colored Dogs

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Many owners of white or light-colored dogs are distressed by the reddish-brown staining around the eyes. Understanding what causes it and when it’s a concern helps you decide on action.

What Causes Tear Staining

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Porphyrins: Tears contain porphyrins—naturally occurring molecules that are breakdown products of red blood cells. Porphyrins are also found in saliva and urine. When tears sit on light-colored fur, porphyrins are exposed to sunlight and air, oxidizing and turning reddish-brown.

Why some dogs more than others:

• Coat color: Shows more on white, cream, and light-colored fur
• Facial structure: Brachycephalic breeds and breeds with prominent eyes have tear overflow due to shallow orbits and compressed tear ducts
• Tear composition: Some dogs produce tears with higher porphyrin concentrations
• Blocked or narrow tear ducts: Tears overflow onto face instead of draining
• Eye irritation: Anything causing excessive tearing (hair in eye, entropion, allergies, infections) leads to more staining

Is Tear Staining a Medical Problem?

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Usually cosmetic: In most cases, tear staining is purely a cosmetic issue. If your dog has reddish-brown crusty staining but the eyes themselves look normal (no redness, no cloudiness, no squinting), the tear is not excessive (just the staining of dried tears), and your dog is comfortable, it’s typically not a medical concern.

When it indicates a problem: If your dog has excessive fresh tears constantly wetting the fur (not just dried staining), this indicates something is causing overproduction or poor drainage:

• Allergies causing watery eyes
• Blocked tear ducts preventing normal drainage
• Eye irritation (eyelashes rubbing eye, foreign material)
• Shallow orbits causing poor tear distribution
• Corneal irritation

The excessive tearing itself warrants veterinary evaluation to identify and treat the underlying cause.

Managing Tear Staining

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Daily cleaning:

• Wipe around eyes daily with warm water and soft cloth or commercial tear stain wipes
• Use separate clean cloth for each eye to avoid cross-contamination
• Pat dry after cleaning

Trim fur around eyes:

• Keep hair trimmed short around eyes so it doesn’t wick tears onto the face or poke the eye
• Be extremely careful with scissors near eyes—many owners prefer to have a groomer do this

Filtered water:

• Some anecdotal reports suggest that minerals in tap water increase tear staining
• Switching to filtered or bottled water may help in some dogs (scientific evidence is limited)

Diet changes:

• Some owners report improvement when switching protein sources or removing artificial additives
• The theory is that certain foods increase porphyrin production
• Limited scientific evidence, but some dogs may respond

Supplements for tear film quality:

Lutein, zeaxanthin, and omega-3 fatty acids support tear film quality and eye health.

Commercial tear stain removers:

Some products claim to reduce staining from the inside. Check ingredients and veterinary approval before using. Avoid products containing antibiotics (tylosin) unless specifically prescribed by your vet.

What NOT to do:

• Don’t use products with antibiotics long-term without vet supervision: Chronic antibiotic use promotes resistant bacteria and disrupts normal flora
• Don’t use harsh chemicals or hydrogen peroxide near eyes: Risk of chemical injury
• Don’t ignore excessive fresh tearing: Have it evaluated

When to See Your Vet About Tear Staining

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• Excessive watering keeping fur constantly wet (not just dried staining)
• Staining suddenly worsens dramatically
• Accompanied by redness, squinting, or discharge beyond clear tears
• Hair growing into eyes causing irritation
• Suspected blocked tear duct

Supplements for Eye Health and Disease Prevention

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While supplements don’t replace medical treatment for active eye disease, certain nutrients support overall eye health and may help prevent or slow some conditions.

Omega-3 Fatty Acids (EPA and DHA)

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Benefits:

• Reduce inflammation in dry eye and allergic eye disease
• Support meibomian gland function (glands that produce oily component of tears)
• Support retinal health
• May reduce risk of some degenerative eye diseases

Dosage: 20-55 mg combined EPA/DHA per pound of body weight daily Source: Fish oil (wild-caught fish), algae oil (vegetarian option), krill oil

Lutein and Zeaxanthin

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Benefits:

• Carotenoid antioxidants that concentrate in the retina and lens
• Filter harmful blue light
• Protect against oxidative damage
• May reduce risk of cataracts and age-related retinal degeneration

Dosage: 5-20 mg lutein daily depending on size Source: Supplements formulated for eye health, kale, spinach (though dogs don’t absorb plant sources as efficiently)

Vitamin A

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Benefits:

• Essential for retinal function (component of rhodopsin, the visual pigment)
• Supports corneal health and tear film
• Deficiency (rare) causes night blindness and corneal problems

Dosage: Most complete dog foods provide adequate vitamin A; supplementation usually not needed unless specific deficiency identified Caution: Excess vitamin A is toxic (hypervitaminosis A)—don’t over-supplement

Vitamin C

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Benefits:

• Antioxidant that protects lens and retina from oxidative damage
• May reduce risk of cataracts
• Dogs synthesize their own vitamin C, so deficiency is rare

Dosage: 100-500 mg daily depending on size (not typically necessary unless specific indication)

Vitamin E

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Benefits:

• Fat-soluble antioxidant working synergistically with vitamin C
• Protects cell membranes in retina and lens from oxidative damage

Dosage: 100-400 IU daily depending on size

Bilberry Extract

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Benefits:

• Contains anthocyanins, powerful antioxidants
• Traditionally used for eye health
• Some evidence for improving night vision and supporting retinal health
• May help with retinal vascular health

Dosage: Follow product recommendations (typically 20-40 mg extract per 20 lbs body weight)

Astaxanthin

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Benefits:

• Potent carotenoid antioxidant (stronger than lutein)
• Crosses blood-retinal barrier
• Reduces oxidative stress in retina
• May support dogs with diabetic retinopathy or age-related changes

Dosage: 1-4 mg daily depending on size

Hyaluronic Acid

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Benefits:

• Component of tear film and vitreous humor (gel inside eye)
• Supports tear film stability in dry eye
• Wound healing for corneal ulcers

Dosage: Typically used in topical eye drop form rather than oral supplements

Who Benefits from Eye Supplements?

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• Dogs with breed predispositions to eye disease
• Senior dogs at risk for age-related changes
• Dogs with diagnosed early-stage conditions (cataracts, PRA) where slowing progression is the goal
• Dogs with dry eye or chronic conjunctivitis as part of comprehensive management
• Dogs recovering from eye surgery

Important: Supplements support but don’t replace veterinary care. They won’t cure active infections, ulcers, or glaucoma. Always discuss with your vet before starting supplements, especially if your dog takes other medications.

Age Considerations in Eye Disease

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Eye problems vary by life stage.

Puppies (Under 1 Year)

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Common issues:

• Viral conjunctivitis: Puppies in group settings (shelters, breeders, kennels) are vulnerable to contagious viruses causing red, watery eyes. Usually self-limiting but may require supportive care.
• Congenital defects: Cherry eye, entropion, distichiasis (extra eyelashes), and some forms of cataracts are present from birth or develop in the first year.
• Trauma from play: Rough play with other dogs or cats can result in corneal scratches.
• Foreign bodies: Curious puppies exploring may get grass seeds or debris in eyes.

What to watch for: Any discharge, squinting, or redness. Congenital issues often become apparent as the puppy grows.

Adult Dogs (1-7 Years)

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Common issues:

• Trauma and injuries: Active adult dogs sustain corneal ulcers from running through brush, play injuries, or fights.
• Allergic conjunctivitis: Environmental or food allergies manifest in adulthood.
• Dry eye (KCS): Often develops in young to middle-aged adults (2-6 years) in predisposed breeds.
• Glaucoma: Primary glaucoma typically develops in middle-aged adults (4-8 years).

What to watch for: Changes from baseline. Active dogs with sudden squinting after outdoor activity (corneal ulcer), seasonal watery eyes (allergies), thick mucus discharge (dry eye).

Senior Dogs (7+ Years)

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Common issues:

• Cataracts: Age-related clouding of the lens is common in seniors. Doesn’t cause pain but gradually reduces vision.
• Dry eye: Can develop at any age but incidence increases with age.
• Glaucoma: Both primary glaucoma (breed-predisposed) and secondary glaucoma (from cataracts, lens luxation, tumors) increase with age.
• Corneal endothelial degeneration: The inner layer of the cornea stops pumping fluid out efficiently, causing cloudiness.
• Retinal degeneration: Age-related retinal changes or progression of hereditary diseases like PRA.
• Tumors: Eyelid tumors, conjunctival tumors, and intraocular tumors become more common.

What to watch for: Cloudiness developing inside the eye (cataracts), cloudy cornea (degeneration or glaucoma), vision loss, any new lumps or growths on eyelids, behavior changes suggesting decreased vision.

Importance of senior eye exams: Annual or biannual veterinary eye exams for senior dogs catch problems early. Many age-related conditions progress slowly and dogs adapt so well that owners don’t notice vision loss until it’s advanced.

Prevention Strategies: Protecting Your Dog’s Eyes

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While not all eye problems are preventable, you can reduce risks.

Daily Eye Checks

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Make eye examination part of your daily routine. Look for:

• Clear, bright, moist eyes
• No discharge beyond minimal clear tears
• No redness
• No cloudiness
• Equal pupil sizes
• No squinting

Early detection of changes allows prompt treatment.

Keep Face and Eyes Clean

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• Wipe around eyes daily with damp cloth, especially in breeds prone to tear staining
• Keep facial folds clean in brachycephalic breeds
• Remove any crusty discharge gently

Trim Hair Around Eyes

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Long hair that hangs into eyes can irritate, scratch the cornea, and wick tears onto the face. Keep it trimmed short. If you’re not comfortable doing this yourself, have a professional groomer trim it regularly.

Protect Eyes During Activity

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• Car rides: Don’t let your dog hang their head out the window at highway speeds. Flying debris can cause serious corneal injuries. Crack the window a few inches or use dog goggles if your dog loves wind in their face.
• Rough play: Monitor play with other dogs. Break it up if play is too rough or if dogs are targeting each other’s faces.
• Outdoor adventures: Be aware of hazards. Tall grass, brush, and weeds can scratch eyes. Some owners use dog goggles (Rex Specs or similar) for dogs who run through heavy brush.

Avoid Irritants

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• Keep household chemicals, cleaners, and grooming products away from eyes
• Be careful with flea/tick topical treatments—don’t let product run into eyes
• Avoid smoke exposure (cigarettes, wood smoke)

Filtered Water

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Some evidence suggests filtered water may reduce tear staining and possibly reduce exposure to contaminants that could affect eye health. While not definitively proven, it’s an easy, low-risk change.

Regular Veterinary Care

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Annual wellness exams should include basic eye examination. For breeds predisposed to eye disease, consider:

• Annual eye exams by a veterinary ophthalmologist starting at age 2-3
• Baseline tonometry for glaucoma-prone breeds
• Screening for hereditary diseases (PRA, cataracts) in breeding dogs

Nutrition for Eye Health

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Feed a high-quality complete and balanced diet. Consider:

• Omega-3 supplementation for anti-inflammatory benefits
• Antioxidant-rich foods and supplements for aging dogs
• Avoiding foods your dog is allergic to (if food allergies contribute to eye symptoms)

When to See an Emergency Vet vs. Your Regular Vet

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Knowing the urgency level helps you act appropriately without unnecessary panic or dangerous delays.

EMERGENCY (Go to emergency vet immediately or within hours)

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• Eye trauma: Something struck the eye, penetrating injury, chemical exposure
• Eye prolapse (proptosis): Eyeball popped out of socket
• Glaucoma signs: Cloudy blue cornea, dilated unresponsive pupil, severe pain, red eye, sudden vision loss
• Sudden blindness: Especially in both eyes (could be retinal detachment, optic nerve problem, or brain issue)
• Extremely painful eye: Dog is frantic, won’t eat, hiding, aggressive when you approach their head
• Bloody discharge: Blood coming from the eye

Why it’s an emergency: These conditions can cause permanent blindness within hours to days, or indicate life-threatening problems. Immediate treatment is essential to save vision and relieve suffering.

URGENT (Same day or within 24 hours—call your vet for same-day appointment)

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• Severe squinting (blepharospasm): Forcefully holding eye closed
• Thick yellow-green pus discharge: Especially if profuse or with squinting
• Corneal cloudiness: Any loss of clarity of the normally clear cornea
• Cherry eye: Newly appeared (not an emergency but should be evaluated soon)
• Foreign body in eye: Something visible stuck in eye
• Not improving or worsening: Any condition you were monitoring at home that isn’t better in 24 hours or is getting worse

Why it’s urgent: Corneal ulcers and serious infections worsen rapidly. Same-day treatment prevents complications and relieves pain.

SOON (Schedule appointment within 2-5 days)

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• Mild conjunctivitis: Light redness, mild clear or mucoid discharge, but dog is comfortable
• Persistent tear staining with excessive tearing: Chronic overflow suggesting blocked duct or other issue
• Mild squinting: Occasional subtle squinting or mild discomfort
• Vision changes: Gradual decrease in vision, bumping into things occasionally

Why soon is okay: These conditions are less likely to rapidly worsen but still need diagnosis and treatment.

ROUTINE (Schedule at regular checkup or within 1-2 weeks)

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• Tear staining only: Cosmetic staining without excessive fresh tearing
• Scheduled recheck: Following up on a condition that’s improving as expected
• Breed screening: Routine screening for hereditary conditions in predisposed breeds

Frequently Asked Questions

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Can I use my own eye drops on my dog?

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No, don’t use human over-the-counter eye drops on your dog without veterinary guidance. Many contain ingredients that are harmful to dogs or that can mask symptoms you need to observe. For example:

• Visine and other redness-relief drops contain vasoconstrictors that hide redness without treating the cause and can be toxic if your dog licks them
• Contact lens solutions contain preservatives that can damage the cornea
• Allergy drops may contain antihistamines in concentrations inappropriate for dogs

The only safe home option is preservative-free sterile saline for gentle rinsing. For any treatment, see your vet for appropriate prescription.

How do I know if my dog’s eye problem is an emergency?

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Use these emergency criteria:

• Obvious severe pain: Forceful squinting, hiding, not eating, aggression when you approach their head
• Sudden vision loss: Bumping into things, disorientation, dilated pupils
• Cloudy blue cornea: This indicates glaucoma or severe corneal swelling
• Pupil problems: One pupil much larger than the other, or pupils not responding to light
• Eye trauma: Something hit the eye, chemical in eye, eye popped from socket
• Blood from the eye
• Condition rapidly worsening: Gets significantly worse in a few hours

If any of these apply, go to emergency vet or regular vet immediately. For less severe symptoms like mild discharge or light redness without pain, you can wait for a regular appointment.

My dog has thick white mucus in their eyes every morning. Is this normal?

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No, thick white or gray mucus is not normal. This is the classic sign of dry eye (keratoconjunctivitis sicca or KCS). The eye isn’t producing enough watery tears, so it compensates by making excessive mucus. Without treatment, dry eye leads to painful ulceration and blindness.

What to do: See your vet for a Schirmer tear test. If it’s dry eye, treatment with cyclosporine or tacrolimus drops twice daily can usually manage it successfully, but it requires lifelong treatment.

Can dog eye infections go away on their own?

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Mild viral conjunctivitis might resolve on its own with supportive care (keeping eyes clean). However:

• Bacterial infections (yellow-green pus) need antibiotic treatment. They won’t resolve without it and can worsen, potentially leading to ulceration.
• Corneal ulcers need treatment to heal properly and prevent infection and perforation.
• Underlying conditions like dry eye, allergies, or blocked ducts won’t go away without addressing the cause.

If your dog has any eye symptoms, it’s always safest to have your vet examine them. Untreated eye problems can worsen rapidly and threaten vision.

Are certain dog breeds more prone to eye problems?

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Yes, many breeds have genetic predispositions to specific eye diseases:

• Cocker Spaniels: Dry eye, cherry eye, glaucoma, cataracts
• Bulldogs, Pugs, Boston Terriers (flat-faced breeds): Corneal ulcers, prominent eyes vulnerable to trauma, entropion, tear duct problems
• Poodles: Progressive retinal atrophy, cataracts, tear staining
• Shar Peis, Chow Chows: Entropion, glaucoma
• Basset Hounds: Glaucoma, cherry eye, ectropion
• Siberian Huskies: Glaucoma, corneal dystrophy, progressive retinal atrophy
• Yorkshire Terriers: Dry eye, cataracts

If you have a breed prone to eye problems, be especially vigilant about daily eye checks and consider annual eye exams by a veterinary ophthalmologist.

What does it mean if my dog’s eye discharge is green?

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Green or yellow-green discharge indicates bacterial infection. The green color comes from white blood cells (neutrophils) that have responded to fight the infection. Common causes include:

• Bacterial conjunctivitis
• Infected corneal ulcer
• Secondary infection accompanying dry eye or another condition

What to do: See your vet within 24 hours. Your dog will need antibiotic eye drops or ointment. Don’t wait—bacterial infections worsen rapidly and can damage eye structures.

How can I tell if my dog’s vision is decreasing?

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Signs of vision loss include:

• Bumping into furniture, walls, or door frames, especially in unfamiliar places or when furniture is rearranged
• Reluctance to go outside at night (suggests night blindness from retinal degeneration)
• Hesitation before jumping on furniture or going up/down stairs
• Startling easily when approached from the side (loss of peripheral vision)
• Following close behind you rather than exploring independently
• Behavioral changes: More clingy, anxious, or cautious
• Dilated pupils that don’t constrict in bright light
• Lack of tracking: Eyes don’t follow a toy or treat moving in front of them

If you suspect vision loss, see your vet for a complete eye exam including assessment of pupil responses, tracking, and ophthalmoscopic examination of the retina.

Conclusion: Protecting Your Dog’s Vision

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Your dog’s eyes tell a story through their discharge, appearance, and the behaviors your dog displays. A small amount of clear tears is normal; thick pus, excessive watering, bloody discharge, or discharge accompanied by pain signals a problem requiring veterinary attention.

Remember these key takeaways:

Use discharge color as your diagnostic guide:

• Clear and watery (excessive): allergies, blocked duct, irritation
• Yellow-green pus: bacterial infection needing antibiotics
• Thick white mucus: dry eye needing lifelong treatment
• Brown crusty: usually cosmetic tear staining
• Bloody: always an emergency

Recognize true emergencies: Glaucoma (cloudy blue eye, dilated pupil, severe pain) and corneal ulcers (severe squinting, cloudiness) can cause permanent blindness within 24-48 hours. Eye trauma, sudden vision loss, and bloody discharge also demand immediate care.

When you can monitor at home: Very mild clear discharge with no other symptoms in a comfortable dog can be observed for 24 hours. But if it doesn’t improve, worsens, or any other symptoms develop—squinting, redness, cloudiness—see your vet.

Early detection saves vision: Daily eye checks catch problems early when they’re most treatable. Know what’s normal for your dog—clear, bright eyes with no discharge, redness, cloudiness, or squinting.

Breed matters: If you have a breed predisposed to eye disease (Cocker Spaniels, flat-faced breeds, Poodles, Shar Peis, Basset Hounds, Huskies), be especially vigilant and consider regular eye exams by a veterinary ophthalmologist.

Action steps:

1. Check your dog’s eyes daily as part of your routine
2. Note any discharge—color and amount
3. Watch for squinting, pawing at eyes, light sensitivity, redness, or cloudiness
4. For mild symptoms in an otherwise comfortable dog, you can monitor for 24 hours
5. For severe symptoms (pus, squinting, cloudiness, pain, vision changes), see your vet same day
6. For emergency signs (glaucoma symptoms, trauma, sudden blindness, blood), go immediately

Your vigilance and quick action when problems arise can save your dog’s vision and prevent unnecessary pain. Trust your observations—you know your dog best. When in doubt, err on the side of caution and have your vet examine any concerning eye changes. With prompt appropriate care, most eye problems in dogs can be successfully managed, preserving vision and quality of life.

Top 8 Products for Dog Eye Care

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These products support eye health, aid in cleaning, and provide comfort for dogs with eye issues.

Gentle sterile eye wash for flushing debris and irritants, safe for routine cleaning.

Convenient pre-moistened wipes for daily cleaning around eyes, removing discharge and tear stains.

Soft, comfortable alternative to hard plastic e-collars for protecting eyes during healing.

Soft, sterile gauze for gentle cleaning around eyes without irritation.

External application solution for reducing existing tear stains on fur.

Medical-grade sterile gauze for cleaning and applying compresses.

Related Articles

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• Dog Health Symptoms: Understanding What Your Pet’s Body Is Telling You
• Dog Allergies: Causes, Symptoms, and Treatment Options
• Senior Dog Care: What Changes to Watch for as Your Dog Ages
• Dog First Aid: Essential Skills Every Owner Should Know
• Choosing a Veterinarian: What to Look for in Quality Care

References

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1. Gelatt KN, Gilger BC, Kern TJ. Veterinary Ophthalmology, 6th Edition. Wiley-Blackwell; 2021.

2. American College of Veterinary Ophthalmologists. “Keratoconjunctivitis Sicca (Dry Eye).” ACVO Public Resources. https://www.acvo.org/

3. Williams DL. “Immunopathogenesis of keratoconjunctivitis sicca in the dog.” Vet Clin North Am Small Anim Pract. 2008;38(2):251-268. PMID: 18299006

4. Hendrix DV, Adkins EA, Ward DA, et al. “An investigation comparing the efficacy of topical ocular application of tacrolimus and cyclosporine in dogs.” Vet Med Int. 2011;2011:487592. PMID: 21547225

5. Miller PE. “Glaucoma in dogs: diagnosis and management.” Today’s Veterinary Practice. 2019;9(5):62-70.

6. Brooks DE. “Canine conjunctivitis.” In: Bonagura JD, Twedt DC, eds. Kirk’s Current Veterinary Therapy XV. Elsevier; 2014:1192-1198.

7. Maggs DJ. “Corneal disease in dogs: practical diagnostics and therapies.” World Small Animal Veterinary Association Congress Proceedings. 2015.

8. Grahn BH, Storey ES. “Lacrimation and tear film abnormalities in dogs.” Can Vet J. 2004;45(8):657-661. PMID: 15368816

9. Giuliano EA. “Diseases and surgery of the canine cornea and sclera.” In: Gelatt KN, Gilger BC, Kern TJ, eds. Veterinary Ophthalmology. 6th ed. Wiley-Blackwell; 2021:1046-1148.

10. Gelatt KN, MacKay EO. “Prevalence of primary breed-related cataracts in the dog in North America.” Vet Ophthalmol. 2005;8(2):101-111. PMID: 15762246