Is Aspirin Safe for Cats?
Why it’s a problem
A cat’s liver clears aspirin many times more slowly than a dog’s or a human’s, so the drug and its salicylate byproducts linger and accumulate. This can cause stomach ulcers, internal bleeding, dangerous acid buildup in the blood, and liver injury. Even a dose that seems tiny can affect a cat for days.
How to keep your pet safe
Keep all aspirin products, including buffered and enteric-coated versions, stored away from cats. Never self-dose a cat with aspirin — if pain relief is needed, a vet must choose a feline-safe option and a safe regimen.
Warning signs to watch for
Drooling, vomiting (sometimes with blood), refusal to eat, rapid or labored breathing, weakness, unsteadiness, dark tarry stool, and collapse in severe cases.
When to call the vet
Call a veterinarian or a pet poison hotline right away. Because aspirin lingers in cats, a single ingestion may need monitoring and treatment for days — do not wait to see whether symptoms appear.
Common questions
My cat may have licked one aspirin tablet — is that bad?
It can be. Cats clear aspirin so slowly that even a small amount can keep affecting them for days. Call your vet or a pet poison hotline and describe what happened.
Why is aspirin worse for cats than for dogs?
A cat’s liver metabolizes salicylates extremely slowly, so repeated or even single doses build up to toxic levels. This slow clearance is why aspirin has poisoned cats at doses that would only upset a dog.
Can a vet ever use aspirin in cats?
Only in strictly controlled situations with special dosing intervals set by a veterinarian. It is never something an owner should do at home.
More medications hazards for cats
This page is general educational information, not a substitute for professional veterinary advice. Every pet is different — if your animal ate or touched something concerning, contact your veterinarian or a pet poison hotline right away. In the US: Pet Poison Helpline (855) 764-7661, ASPCA Animal Poison Control (888) 426-4435 (fees may apply).