Can pets eat Onion?

What Pet Owners Should Know About Onion

Onion falls under the vegetables category in our pet food safety database. For dogs, onion is rated as toxic, with a recommended portion of none. For cats, the same food is rated toxic, with a suggested portion of none. Ratings in our database are anchored to veterinary toxicology references, ASPCA Animal Poison Control guidance, and peer-reviewed nutrition research, not anecdotal reports, so pet owners can make decisions based on the same evidence a vet would cite in clinic.

Dog- and cat-specific reactions to the same food can differ significantly because of metabolic differences between the two species. Known risks for dogs include thiosulfates cause heinz body anemia and all forms toxic: raw, cooked, powdered, which is why portion and preparation instructions matter more than the food itself. For cats, watch for thiosulfates extremely toxic to cats and even more sensitive than dogs. When a pet food is rated caution or unsafe, the rating typically reflects either a compound that is marginally tolerated in small amounts, a preparation step (cooking, removing pits, peeling) that transforms risk, or a quantity threshold above which gastrointestinal distress or organ stress becomes likely.

This page links out to species-specific full guides for onion covering warning signs, emergency steps, and cross-reference data. Dogs exhibiting symptoms such as lethargy, pale gums, vomiting, weakness, reddish urine after exposure should be seen by a vet immediately. For cats, the symptoms to watch for are lethargy, anemia, vomiting, difficulty breathing. If your pet has consumed a large amount of any food rated caution or worse, the ASPCA Animal Poison Control hotline at 888-426-4435 operates 24/7. Use the dog and cat cards below to move from this overview into the detailed safety, portion, preparation, and risk data for your specific pet.