Are Onions Toxic to Cats?
Yes — onions are toxic to cats.
PawSafe Check is for general information only and is not veterinary advice. Always contact your veterinarian or a poison control service if you think your pet has been exposed.
Symptoms to watch for
- Vomiting
- Diarrhea
- Weakness or low energy
- Pale gums
- Fast breathing or heart rate
- Red or brown urine (anemia can appear several days later)
Toxic parts
Raw, cooked, powdered and dehydrated onion
Toxic compound
Organosulfur compounds (N-propyl disulfide)
What to do now
- Call your vet or a pet poison control line immediately — don't wait for symptoms.
- Do not induce vomiting unless a vet tells you to.
- Bring the plant, label or packaging with you so the vet knows exactly what your cat ate.
- Note roughly how much was eaten and when.
Good to know
Onion damages red blood cells and can cause anemia. Onion powder in baby food, gravy and seasonings counts too. Cats are especially sensitive.
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Frequently asked questions
Can cats eat onions?
No. Yes — onions are toxic to cats.
Are onions toxic to cats?
Yes — onions are toxic to cats. Onion damages red blood cells and can cause anemia. Onion powder in baby food, gravy and seasonings counts too. Cats are especially sensitive.
What are the symptoms of onions poisoning in cats?
Vomiting. Diarrhea. Weakness or low energy. Pale gums. Fast breathing or heart rate. Red or brown urine (anemia can appear several days later).
What should I do if my cat ate onions?
Call your vet or a pet poison control line immediately — don't wait for symptoms. Do not induce vomiting unless a vet tells you to. Bring the plant, label or packaging with you so the vet knows exactly what your cat ate. Note roughly how much was eaten and when.
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