Dog Red Eyes — Causes, Symptoms & When to Seek Care
Red or bloodshot eyes in dogs can range from minor irritation to serious conditions requiring immediate care. The redness occurs when blood vessels in the eye become enlarged or inflamed. Identifying accompanying symptoms helps determine the cause and urgency.
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Common Causes
Allergies
Monitor at HomeEnvironmental allergens like pollen, dust, or mold can cause red, itchy, watery eyes. Often affects both eyes and may be seasonal. Common in breeds prone to allergies.
Conjunctivitis (Pink Eye)
Schedule Vet VisitInflammation of the conjunctiva (the membrane covering the eye). Causes redness, swelling, and discharge. Can be caused by allergies, bacteria, viruses, or irritants.
Dry Eye (KCS)
Schedule Vet VisitInsufficient tear production leads to chronic redness, irritation, and a dull appearance to the eye. May cause recurrent infections and thick discharge.
Glaucoma
See Vet ImmediatelyIncreased pressure inside the eye. Causes severe redness, cloudiness, enlarged eye, and pain. This is an emergency — can cause blindness within hours if untreated.
Uveitis
See Vet ImmediatelyInflammation inside the eye. Causes redness, cloudiness, a small pupil, and pain. Can be caused by infections, trauma, immune disorders, or cancer.
Corneal Ulcer
See Vet ImmediatelyA scratch or wound on the eye surface. Causes redness, squinting, tearing, and light sensitivity. Can become infected and worsen rapidly.
Cherry Eye
Schedule Vet VisitProlapse of the third eyelid gland. Appears as a red, fleshy mass in the corner of the eye. Common in certain breeds. Not painful but requires surgical correction.
Foreign Object or Irritant
Schedule Vet VisitDebris, chemicals, or smoke can irritate the eye causing sudden redness and tearing. Usually affects one eye unless exposure was to both.
How to Photograph for Best AI Analysis
Getting a clear photo helps our AI provide more accurate insights. Follow these tips:
- Photograph both eyes for comparison — note if redness is in one or both
- Capture the entire visible eye including the whites (sclera)
- Try to show the pupil size — compare between eyes if possible
- If there's discharge, include that in the photo
- Photograph any swelling around the eye or eyelids
- Take photos in natural light to show the true color of redness
When to See a Veterinarian
Contact your veterinarian if you notice any of the following:
- •Eye appears swollen, bulging, or larger than normal (possible glaucoma — emergency)
- •Cloudiness or haziness in the eye along with redness
- •Severe pain — dog won't let you touch face, hiding, lethargic
- •Redness appeared suddenly and is severe
- •Squinting, keeping eye closed, or excessive blinking
- •Visible injury or foreign object in the eye
- •Redness accompanied by vision changes (bumping into things)
- •Red fleshy mass visible in corner of eye (cherry eye)
How PetSensAI Can Help
PetSensAI's eye scanner can help assess the severity of eye redness and identify accompanying signs like cloudiness, discharge, or swelling. Our AI analysis helps you understand whether the redness is likely minor irritation or something requiring urgent veterinary care.
Related Symptoms
Sources
- Merck Veterinary Manual — Disorders of the Conjunctiva in Dogs
- VCA Animal Hospitals — Corneal Ulcers in Dogs
About the Author
PetSensAI Editorial Team
Pet Health Content
Our editorial team creates pet health guides informed by reputable veterinary sources and reviewed for clarity and safety. Always consult a licensed veterinarian for medical advice.
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