Unsafe

Can cats eat onions?

Cats should never eat onions. All forms — raw, cooked, fried, powdered — can damage red blood cells. Onion powder in broths and baby food is an easy hidden source.

Not medical advice — general pet-safety info only. Confirm with your vet before changing your cat’s diet.

Updated Aug 4, 2026 Category Nutrition

Safer alternatives to onions

Onions are toxic to cats. Keep real cat treats on hand instead.

Healthy cat treats

Safe rewards instead of table scraps.

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Meat-based cat treats

Meaty treats without allium seasoning.

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Lickable cat treats

A safer savory topper than onion gravy.

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How much is okay?

There is no safe onion serving for cats.

Kitten / small adult
None
Keep it tiny and occasional.
Typical adult
None
Plain preparation only.
Large / big appetite
None
Still an extra, not a meal.

Rule of thumb: treats of all kinds should stay under ~10% of daily calories.

How to prepare them

  • Keep onions and onion powder out of cat reach.
  • Check broths, leftovers, and jarred foods for onion.
  • Call a vet or pet poison hotline if onion was eaten.

Risks & exceptions

  • Oxidative damage to red blood cells.
  • Powdered onion is concentrated.
  • Symptoms can be delayed.

Onions are toxic to cats in all common forms — including powder.

If your cat ate any

If they ate more than intended, watch for stomach upset and changes in behavior.

  • Drooling
  • Mild vomiting

Call your vet / pet poison line if:

  • Any meaningful onion ingestion
  • Weakness
  • Pale gums
  • Dark urine
  • Ongoing vomiting

FAQ

Can cats eat cooked onions?

No — cooking does not make onions safe.

Is onion powder dangerous?

Yes — often more concentrated than fresh.

What about garlic?

Also an allium risk — keep both away.

Affiliate disclosure: we may earn a commission from product links. Safety guidance is editorial and may change — verify with your veterinarian for your cat.