Can cats eat onions?

Onions contain an ingredient called thiosulphate which is toxic to cats and dogs. The ingestion of onions causes a condition called hemolytic anemia, which is characterized by damage to the red blood cells. Onion toxicity can cause the red blood cells circulating through your pet's body to burst. read more

Cats should not be eating anything that has been prepared with onions, because it can cause a kind of feline anemia, which is a blood disease that affects the red blood cells in the cat. Onions are toxic to cats, and they damage the cat's red blood cells and cause abnormalities in them. read more

Onion in all forms -- powdered, raw, cooked, or dehydrated -- can break down a cat's red blood cells, leading to anemia. That's true even for the onion powder that's found in some baby foods. An occasional small dose probably won't hurt. But eating a large quantity once or eating smaller amounts regularly can cause onion poisoning. read more

The following is a list of foods that cats should never eat: Onions, Garlic, & Related Root Vegetables Onions contain a substance (N-propyl disulphide) which destroys red blood cells in the cat, causing a form of anemia called Heinz body anemia. read more