Can Cat Eat onion?
Also known as:
Allium cepa
Onions are extremely toxic to cats and can cause life-threatening anemia.
DangerousVegetable
Dangerous for Cats
This food is toxic to cats and should never be given to them.
Onions, like garlic, are in the Allium family. They contain N-propyl disulfide, a compound that destroys a cat's red blood cells, whether the onion is raw, cooked, or in powder form.
Detailed Information
Onions, like garlic, are in the Allium family. They contain N-propyl disulfide, a compound that destroys a cat's red blood cells, whether the onion is raw, cooked, or in powder form.
Recommendations
NEVER give your cat onion. Be very careful with human foods, as many contain onion powder for flavoring. If you suspect ingestion, it is a medical emergency.
Veterinary Advice
Avoid completely. Contact your veterinarian immediately if consumed.
Quick Facts
Safety LevelDangerous
CategoryVegetable
Last Updated7/24/2025
Sources
- ASPCA Animal Poison Control Center
- Veterinary Nutritionist Guidelines
- Pet Food Safety Research
Emergency Information
If your cat has consumed onion, contact your veterinarian or pet poison control immediately.
ASPCA Animal Poison Control: (888) 426-4435
Pet Poison Helpline: (855) 764-7661