Can pets eat onion? 🧅
Here’s whether onion is safe for each kind of pet, based on established veterinary guidance.
Can dogs eat onion?
UnsafeOnion is toxic to dogs in any form (raw, cooked or powdered).
Risk: Damages red blood cells and can cause life-threatening anaemia.
Full guidance: can dogs eat onion? →Can cats eat onion?
UnsafeOnion is highly toxic to cats and must be avoided.
Risk: Cats are especially sensitive; even small amounts can cause anaemia.
Full guidance: can cats eat onion? →Can rabbits eat onion?
UnsafeNever feed onion to rabbits.
Risk: Toxic to rabbits and can cause blood abnormalities and weaken the immune system.
Full guidance: can rabbits eat onion? →Can guinea pigs eat onion?
UnsafeOnion is toxic to guinea pigs and must be avoided.
Risk: Can damage red blood cells and cause digestive problems.
Full guidance: can guinea pigs eat onion? →Can hamsters eat onion?
UnsafeNever give onion to hamsters.
Risk: Toxic and can cause blood disorders and digestive upset.
Full guidance: can hamsters eat onion? →Worried your pet has eaten too much?
Contact your vet straight away, or call the Animal PoisonLine on 01202 509000 (24/7, UK). This page is general guidance based on veterinary sources and isn’t a substitute for professional advice — amount, preparation and your pet’s health all matter.