Can Cats Eat Green Onions?

NoEmergency risk
Verdict for cats: Toxic · Evidence: H · Last verified: 2026-11-01 (seed data — veterinary review pending)

No. Green Onions is toxic to cats. It contains Allium compounds. 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

Allium compounds

Which parts are the problem?

all parts

Dose & exposure rules

Same family risk

If it must be on the menu: safe preparation

None — cats highly sensitive

Symptoms to watch for

lethargypale gumsweakness

Anemia delayed 1-5 days

What to do now

Vet visit

✔ Reviewed against ASPCA. Veterinary review pending — this page will carry a named, licensed veterinarian's sign-off after review (see team and editorial policy). General information only, not veterinary advice.

FAQ

How much green onions can a cat eat?

Same family risk

What are the signs of green onions problems in cats?

Watch for: lethargy; pale gums; weakness. Anemia delayed 1-5 days

What should I do if my cat ate green onions?

Vet visit

Related:

Can dogs eat green onions?

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