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Vegetables
Can Cats Eat Onions?
TOXIC - Do not feed
Quick Answer
No, onions is toxic to cats and should never be fed to them. All onions (raw, cooked, powder) are toxic to pets and can cause anemia.
Emergency Warning
If your cat has eaten onions, contact your veterinarian or Pet Poison Control (888-426-4435) immediately. Do not wait for symptoms.
Reviewed by Clawmate Vet Team•Updated February 2026
🐱Specifically for Cats
Cats are MORE sensitive to onion toxicity than dogs. Even small amounts in baby food can be harmful.
The Full Story
Onions contain N-propyl disulfide, which damages red blood cells, causing hemolytic anemia. All forms are dangerous: raw, cooked, powdered, or dehydrated. Garlic, leeks, shallots, and chives are also in the allium family and similarly toxic. Cats are especially sensitive.
⚠️ Important Warnings
- Avoid all forms of onion
- Check labels for onion powder
- Symptoms may be delayed 3-5 days
- Garlic is also toxic
Frequently Asked Questions
Can cats eat onions?▼
TOXIC - Do not feed. All onions (raw, cooked, powder) are toxic to pets and can cause anemia. Cats are MORE sensitive to onion toxicity than dogs. Even small amounts in baby food can be harmful.
Is onions safe for cats?▼
Onions contain N-propyl disulfide, which damages red blood cells, causing hemolytic anemia. All forms are dangerous: raw, cooked, powdered, or dehydrated. Garlic, leeks, shallots, and chives are also in the allium family and similarly toxic. Cats are especially sensitive.
What should I do if my cat ate onions?▼
Contact your veterinarian or Pet Poison Control (888-426-4435) immediately. Do not wait for symptoms to appear. Avoid all forms of onion Check labels for onion powder Symptoms may be delayed 3-5 days Garlic is also toxic
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Trusted sources: ASPCA Poison Control · Pet Poison Helpline · AVMA Pet Owners