Upper respiratory infection in cats
Cat colds are usually caused by feline herpesvirus or calicivirus, sometimes with bacteria. They spread easily in shelters and multi-cat homes.
Last updated: October 2026 · 3 sources · see sources
Signs to watch for
- Sneezing
- Runny nose
- Watery eyes
- Mouth ulcers
- Poor appetite
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
Vets usually diagnose it from the exam. PCR testing may be used in shelters or stubborn cases. [2][3]
How it's treated
Supportive care with fluids, nutrition and eye care. Antibiotics are used for bacterial infection. [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 recover in one to three weeks. Herpes may flare up again with stress. [2][3]
Common questions
What is upper respiratory infection in cats?
Cat colds are usually caused by feline herpesvirus or calicivirus, sometimes with bacteria. They spread easily in shelters and multi-cat homes.
What are the signs of upper respiratory infection?
Common signs include: sneezing, runny nose, watery eyes, mouth ulcers, poor appetite.
How do vets diagnose upper respiratory infection?
Vets usually diagnose it from the exam. PCR testing may be used in shelters or stubborn cases.
How is upper respiratory infection treated?
Supportive care with fluids, nutrition and eye care. Antibiotics are used for bacterial infection.
How much does upper respiratory infection cost to treat?
Diagnosis (exam and tests): $50–$200; Treatment: $100–$400. 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.