Can Cats Eat Onions?
Short answer: No. Onions are toxic to cats, and the ASPCA says cats are more susceptible than dogs. They can damage red blood cells and cause anemia.
Why it’s a problem
Onions, garlic and chives can irritate the digestive tract and damage red blood cells, which can lead to anemia. The ASPCA notes that cats are more susceptible than dogs. Onion also hides in sauces, soups, baby food and seasoning mixes.
How much and how to serve it
None. Don’t feed onion in any form, and keep onion-containing leftovers out of reach.
Risks to watch for
- Stomach irritation.
- Red blood cell damage and anemia.
- Cooked, raw and powdered onion should all be treated as unsafe.
What to do if your cat ate onions
Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 right away, even if your cat seems fine.
Related foods
- Can cats eat bananas? 🟡 Yes, in moderation
- Can cats eat cucumbers? 🟢 Yes, safe
- Can cats eat chicken? 🟡 Yes, in moderation
FAQ
How much onion is dangerous for a cat?
The ASPCA doesn’t give a safe amount and says cats are more susceptible, so don’t take chances. Call your vet if your cat ate any.
Is onion powder in food a problem?
Treat it as unsafe too. Check ingredient lists on human foods before sharing.
Search our full list of human foods and see whether they’re safe for your cat.
Browse all foods →Sources
By the Petybuzz Editorial Team · Last checked November 10, 2026. This page is general information for pet owners, not veterinary advice. Every cat is different: if yours has a medical condition, is on a special diet, or you’re unsure, ask your veterinarian.