Dog Eye Discharge — Colors, Causes & When It's Serious
Some eye discharge in dogs is normal — they produce tears that collect debris and drain. However, changes in the amount, color, or consistency of discharge can indicate allergies, infections, or eye injuries. The color of the discharge is a key indicator of the underlying cause.
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Common Causes
Normal Tear Production
Monitor at HomeSmall amounts of clear or slightly brownish discharge in the corners of the eyes is normal, especially after sleeping. This is just dried tears mixed with dust and debris.
Allergies
Monitor at HomeEnvironmental allergies (pollen, dust, mold) can cause watery, clear discharge often accompanied by redness and itching. May be seasonal or year-round.
Conjunctivitis (Pink Eye)
Schedule Vet VisitInflammation of the eye's outer membrane. Causes red, swollen eyes with discharge that may be clear, white, yellow, or green depending on the cause (viral, bacterial, or allergic).
Bacterial Infection
Schedule Vet VisitYellow or green, thick, pus-like discharge usually indicates a bacterial infection. The eye may be red, swollen, and your dog may squint or paw at it.
Dry Eye (KCS)
Schedule Vet VisitKeratoconjunctivitis sicca occurs when tear production is insufficient. Causes thick, mucus-like discharge, dull cornea, and frequent eye infections.
Corneal Ulcer or Injury
See Vet ImmediatelyScratches or injuries to the eye surface cause excessive tearing, discharge, squinting, and light sensitivity. Can become infected if untreated.
Foreign Object
Schedule Vet VisitGrass seeds, dirt, or debris in the eye causes sudden onset of tearing, discharge, and pawing at the eye. The eye may appear red and irritated.
Blocked Tear Ducts
Monitor at HomeTears normally drain through ducts into the nose. When blocked, tears overflow and cause wet fur and staining below the eyes. Common in certain breeds.
How to Photograph for Best AI Analysis
Getting a clear photo helps our AI provide more accurate insights. Follow these tips:
- Photograph the discharge before wiping it away — the color and consistency provide important clues
- Get a close-up showing both the discharge and the eye itself
- Capture any redness or swelling around the eye
- If discharge is present in both eyes, photograph each eye separately
- Take photos in good lighting to show true colors of discharge
- Include the area below the eye to show any tear staining
When to See a Veterinarian
Contact your veterinarian if you notice any of the following:
- •Yellow or green discharge (indicates infection)
- •Discharge accompanied by squinting or keeping the eye closed
- •Sudden onset of excessive tearing or discharge
- •Eye appears cloudy, hazy, or has a bluish tint
- •Visible swelling of the eye or surrounding tissue
- •Your dog is pawing at the eye constantly
- •Discharge persists for more than a day or two despite cleaning
- •One eye is more affected than the other (may indicate injury)
How PetSensAI Can Help
PetSensAI's eye scanner analyzes photos of your dog's eyes to identify signs of infection, inflammation, or other issues. By assessing discharge color, eye redness, and overall eye health, our AI can help you determine if the discharge is normal or requires veterinary attention.
Related Symptoms
Sources
- Merck Veterinary Manual — Disorders of the Conjunctiva in Dogs
- VCA Animal Hospitals — Keratoconjunctivitis Sicca (Dry Eye) in Dogs
About the Author
PetSensAI Editorial Team
Pet Health Content
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Medical Disclaimer: This content is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a licensed veterinarian for any health concerns about your pet.
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Last updated: 2025-01-09