Can Cats Eat Garlic. It contains a compound called “thiosulfate” that is harmful to cats. To wrap it all up and tie it with a bow—no, your cat should never ingest garlic of any kind.
When cats eat garlic, it may also cause gastroenteritis (upset stomach, vomiting and diarrhea). They shouldn’t even be going near the stuff. Now, if your cat has consumed a tiny bit of garlic, then they should be fine.