Can Guinea Pigs Eat Onion?

Never No — never feed this to guinea pigs

Onion is not safe for guinea pigs. An allium that damages red blood cells and can be fatal, so never feed it.

What to do if your guinea pig ate onion

If your guinea pig has eaten onion, don't wait for symptoms — contact your vet or a pet poison line straight away: ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661. Note how much was eaten and when.

The right everyday diet for guinea pigs

For guinea pigs, unlimited grass hay is the foundation, plus daily leafy greens — and they must get vitamin C from food every day. Treats stay small. Foods like onion are extras, not a substitute for a proper diet.

Frequently asked questions

Can Guinea Pigs Eat Onion?

No. An allium that damages red blood cells and can be fatal, so never feed it.

Is onion toxic to guinea pigs?

Onion is not safe for guinea pigs. An allium that damages red blood cells and can be fatal, so never feed it.

What should I do if my guinea pig ate onion?

Contact your vet or a pet poison line right away — ASPCA Animal Poison Control (888) 426-4435 or Pet Poison Helpline (855) 764-7661. Don't wait for symptoms to appear.

Source for this rating: Oxbow Animal Health (vet-reviewed) ↗. This is general guidance, not veterinary advice — always confirm with your own vet, as every animal is different.

Can other pets eat onion?

Can dogs eat onion? Never Can cats eat onion? Never Can rabbits eat onion? Never Can hamsters eat onion? Never Can birds eat onion? Never

More foods for guinea pigs

Bell pepper Safe Romaine lettuce Safe Cucumber Safe Carrot & carrot tops In moderation Broccoli In moderation Cauliflower In moderation Spinach In moderation Kale In moderation

See the full list of what guinea pigs can and can't eat →