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A red, goopy or squinting eye is one of the most common reasons dogs visit the vet — and one where guessing wrong is costly, because infections, allergies, dry eye and corneal injuries can look nearly identical. Here is how to read the signs, what you can safely do at home, and when same-day veterinary care is non-negotiable.
Signs Your Dog Has an Eye Infection
- Yellow or green discharge (clear discharge points more toward allergies or irritation)
- Redness of the white of the eye or inner eyelids
- Squinting, blinking, or keeping the eye closed
- Pawing or rubbing the face
- Swelling around the eye
Discharge color is your best first clue: clear and watery suggests irritation or allergies; thick yellow-green suggests bacterial conjunctivitis; gray and stringy can indicate dry eye (KCS). Unsure whether it is allergies? Our guide to sudden dog eye discharge breaks down the differences.
Common Types of Dog Eye Infections
Conjunctivitis — inflammation of the pink tissue, from bacteria, viruses, allergies or irritants. The most common and usually the most treatable. Keratitis — inflammation of the cornea itself, often after a scratch; can scar the eye if untreated. Uveitis — deeper inflammation, often painful with a cloudy look; needs prompt vet care. Blocked or infected tear ducts — chronic tearing and recurring infections, common in flat-faced and small breeds.
What You Can Safely Do at Home
For mild irritation with clear discharge: rinse the eye area with a gentle, pH-balanced dog eye cleaning rinse to flush pollen, dust and crust away, and keep the fur around the eye trimmed and dry. Daily rinsing also reduces the tear-staining cycle in white-coated breeds. What you should never do: use human eye drops like Visine (vasoconstrictors are harmful to dogs), leftover antibiotic drops from a previous problem, or anything containing steroids without a vet exam — steroids on an undiagnosed corneal ulcer can be catastrophic. Our guide to dog eye drops covers what is safe and what is not.
Red Flags: See a Vet the Same Day
- Eye held fully closed or visible pain
- Cloudy, blue-tinged or bulging eye
- Blood in or around the eye, or a visible scratch
- Pupil that looks different from the other eye
- No improvement after 48 hours of gentle cleaning
These can indicate corneal ulcers, glaucoma or foreign bodies — conditions where hours matter for saving vision.
Preventing Recurring Eye Infections
Recurrence usually traces to anatomy (folds, protruding eyes), allergies, or chronic tear overflow keeping the area wet. A daily 30-second rinse-and-dry routine prevents most flare-ups. For breed-specific care and tear-stain strategy, see our complete dog eye care guide, and find more guides on Dog Health Insider.
Scientific References
- Maggs DJ, Miller PE, Ofri R. Slatter’s Fundamentals of Veterinary Ophthalmology, 6th ed. Elsevier; 2018. (Veterinary reference text)
- Ledbetter EC, Hornbuckle WE, Dubovi EJ. Virologic survey of dogs with naturally acquired idiopathic conjunctivitis. J Am Vet Med Assoc. 2009;235(8):954-959. (PubMed)
- Kaswan RL, Salisbury MA. A new perspective on canine keratoconjunctivitis sicca: treatment with ophthalmic cyclosporine. Vet Clin North Am Small Anim Pract. 1990;20(3):583-613. (PubMed)
Always consult your veterinarian for any eye problem that involves pain, cloudiness, or does not improve within 48 hours.