Conjunctivitis in cats
Conjunctivitis in cats is commonly caused by feline herpesvirus or chlamydia.
Last updated: October 2026 · 3 sources · see sources
Signs to watch for
- Red, watery eyes
- Squinting
- Discharge
- Third eyelid showing
Trouble breathing, collapse, repeated vomiting, not peeing, or a seizure that lasts more than a few minutes needs a vet right away. See when to see a vet.
How vets diagnose it
Eye exam, dye test and sometimes PCR testing. [2][3]
How it's treated
Eye ointments, antiviral drops or oral medicine depending on the cause. [2][3]
Medicines your vet may mention: Doxycycline. We don't list doses; your vet will decide what fits your pet.
What it costs to diagnose and manage
These are typical US ranges from the sources listed. Your pet's costs depend on how severe things are, the tests your vet recommends, your pet's size and where you live. Ask your vet for a written estimate.
Outlook
Most cats improve, though herpes flare-ups can recur. [2][3]
Common questions
What is conjunctivitis in cats?
Conjunctivitis in cats is commonly caused by feline herpesvirus or chlamydia.
What are the signs of conjunctivitis?
Common signs include: red, watery eyes, squinting, discharge, third eyelid showing.
How do vets diagnose conjunctivitis?
Eye exam, dye test and sometimes PCR testing.
How is conjunctivitis treated?
Eye ointments, antiviral drops or oral medicine depending on the cause.
How much does conjunctivitis cost to treat?
Diagnosis (exam and tests): $75–$200; Treatment: $50–$200. Costs vary with severity, tests, your pet's size and where you live.
Related
This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.