Can Cats Eat Red Onion?
NoEmergency risk
No. Red Onion is toxic to cats. It contains N-propyl disulfide (Allium). There is no amount we can call safe, so it should stay off the menu. If your cat has already eaten some, contact your veterinarian or a pet poison hotline right away.
Your cat already ate some?
Don't wait for symptoms. Call your veterinarian now, or a pet poison hotline:ASPCA Animal Poison Control (US): (888) 426-4435 (a fee may apply) · Pet Poison Helpline (US/CA): (855) 764-7661 (a fee applies)
Why it is toxic
N-propyl disulfide (Allium)
Which parts are the problem?
all forms
Dose & exposure rules
Even small amounts are dangerous
If it must be on the menu: safe preparation
None — cats are more sensitive
Symptoms to watch for
lethargypale gumsred or brown urine
Anemia delayed 1-5 days
What to do now
Vet visit
FAQ
How much red onion can a cat eat?
Even small amounts are dangerous
What are the signs of red onion problems in cats?
Watch for: lethargy; pale gums; red or brown urine. Anemia delayed 1-5 days
What should I do if my cat ate red onion?
Vet visit
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