Can dogs eat onions?
Toxic to dogs. Onions damage red blood cells and can cause anaemia, raw or cooked.
Onions belong to the allium family and are documented as toxic to dogs in every form: raw, cooked, powdered or dried. They contain compounds that damage red blood cells and can lead to anaemia, sometimes days after eating. Onion powder in gravies, stocks and seasoned leftovers is a common hidden source.
Classification reflects guidance from ASPCA, VCA, Kennel Club.
Other vegetable foods
Note. Food-safety classifications are compiled from published guidance by the ASPCA, VCA Hospitals, the PDSA, Blue Cross and the UK Kennel Club. They are a general, documentary summary of established consensus, not a diagnosis or veterinary advice. Check the full can dogs eat…? list, and where a dog has eaten something unsafe the documented course is to contact a vet.