Redness, discharge, squinting, and swelling are often called an “eye infection,” but several eye diseases can cause the same signs. Treatment depends on whether the problem is bacterial conjunctivitis, dry eye, a corneal ulcer, trauma, glaucoma, allergies, or something else.
Why an eye exam comes first
A veterinarian may examine the eyelids and cornea, use fluorescein stain to look for an ulcer, measure tear production, and check eye pressure when needed. These tests can change the treatment completely.
Antibiotic eye medication
Antibiotic drops or ointments may be prescribed when a bacterial infection is suspected or when there is a corneal injury at risk of infection. Antibiotics do not treat every red or watery eye.
Treatment for dry eye
Dogs with inadequate tear production may need medications that stimulate tears along with lubricating products. Dry eye often requires long-term management.
Treatment for corneal ulcers
Corneal ulcers can be painful and may require antibiotic medication, pain control, an Elizabethan collar, and repeat examinations to confirm healing. Deep or complicated ulcers may require surgery.
Allergy-related eye irritation
If allergies are contributing, treatment may focus on controlling the underlying allergy and using eye medication that is appropriate for the cornea. Do not assume a steroid eye drop is safe just because the eye looks inflamed.
Why leftover eye medication can be dangerous
Some eye drops contain corticosteroids. Steroids can delay healing or seriously worsen certain corneal ulcers, so old medication should not be reused without an examination.
Glaucoma and other emergencies
Glaucoma causes increased pressure inside the eye and can threaten vision quickly. Sudden severe pain, a cloudy or enlarged eye, or abrupt vision loss deserves urgent veterinary care.
What you can do while waiting for an appointment
Gently clean discharge from around the eye with sterile saline or a clean damp cloth and prevent your dog from rubbing the eye. Avoid homemade drops, essential oils, tea preparations, and human redness-relief products.
The bottom line
There is no single treatment for every “eye infection.” Getting the diagnosis right matters because the wrong eye medication can delay healing or make certain conditions worse.
Sources
- Merck Veterinary Manual: Ophthalmic disorders in dogs
- Veterinary ophthalmology guidance on conjunctivitis and corneal ulcers
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.