No to Onions

This is why certain foods are not good for pets. So don't feed your pets any scrape foods that have onions in..... 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.