Dog Eye Infection: Symptoms, Home Care & When It's an Emergency

A red, swollen, or goopy eye in your dog is alarming. Eye infections can range from mild irritation that resolves with home care to emergencies that threaten vision within hours. Here's how to tell the difference.

Common Causes

Conjunctivitis (Pink Eye)

Inflammation of the conjunctiva — the pink tissue lining the eyelids. Signs: redness, swelling, clear to yellow/green discharge, squinting. Causes: allergies, bacterial infection, viral infection, irritants (dust, smoke, wind), or dry eye. Often resolves with antibiotic or anti-inflammatory eye drops from your vet.

Dry Eye (KCS — Keratoconjunctivitis Sicca)

Insufficient tear production leads to chronic eye inflammation, thick mucus discharge, and eventual corneal scarring. Common in Cavalier King Charles Spaniels, Cocker Spaniels, Westies, and Shih Tzus. Requires lifelong management with tear stimulants (cyclosporine or tacrolimus) and artificial tears.

Corneal Ulcer

A scratch or erosion on the cornea surface. Extremely painful. Signs: severe squinting, watery eye, the dog keeps the eye tightly shut, visible dent or cloudiness on the cornea. Can progress to rupture within 24-48 hours. Emergency — can cause blindness.

Cherry Eye

Prolapse of the third eyelid gland — a pink bulge in the inner corner of the eye. Not painful but needs surgical correction. Common in Bulldogs, Cocker Spaniels, Beagles.

Glaucoma

Increased pressure inside the eye causing rapid blindness. Signs: sudden bulging eye, cloudy/bluish cornea, dilated pupils, extreme pain. Emergency — permanent blindness can occur within hours.

Home Care for Mild Cases

Warm compress: gently hold a clean, warm, damp cloth against the closed eye for 5 minutes, 3-4 times daily. This loosens crusted discharge and soothes inflammation. Wipe discharge from the outer corner inward, using a fresh cloth for each eye. Do NOT use human eye drops — Visine, Clear Eyes, and others contain ingredients that constrict blood vessels and are not appropriate for dogs. Do NOT use leftover eye medications from a previous infection — the cause may be different and the medication may be expired.

When It's an Emergency

Sudden squinting or holding the eye closed, eye looks cloudy or blue, visible object or scratch on the eye, the eye seems larger or bulging, bleeding from the eye, dog is pawing at the eye violently. These can lead to permanent vision loss within hours. Go to the vet or veterinary ophthalmologist immediately.

Prevention

Keep facial hair trimmed around the eyes, protect eyes during baths (avoid shampoo contact), use a harness instead of a collar for dogs with eye issues, and seek prompt treatment for any eye irritation.