Verdict
Never feed
Key concern
N-propyl disulfide
Species
🐱 Cats
Why this verdict for cats
Cats are even more sensitive than dogs to onion toxicity, which destroys red blood cells.
Warning signs to watch for
- Weakness
- Pale gums
⚠ If your cat ate onion
Act immediately — don't wait for symptoms.
- Call your vet or a pet poison helpline right away.
- Note how much was eaten and when.
- Do not induce vomiting unless a professional tells you to.
🛡️
Poisoning emergencies are expensive
A single toxicity visit can cost hundreds. Compare pet insurance plans that cover accidents and poisoning.
Ad placement
Frequently asked questions
Can cats eat onion?
No. Cats are even more sensitive than dogs to onion toxicity, which destroys red blood cells.
How much onion can cats have?
None — onion is not safe for cats and should be avoided entirely. When in doubt, ask your vet.
Is onion safe for dogs too?
Verdicts can differ between species. See the dog answer for onion →
Related foods
By the CanMyPet Editorial Team · Reviewed against ASPCA Animal Poison Control, the American Kennel Club (AKC) and Pet Poison Helpline · Last updated June 2026.
Sources
- ASPCA — People Foods to Avoid Feeding Your Pets
- American Kennel Club — Dog Nutrition
- Pet Poison Helpline — Poison List
CanMyPet provides general information reviewed against trusted sources (ASPCA, AKC, Pet Poison Helpline). It is not a substitute for professional veterinary advice. When in doubt, always contact your veterinarian.