• Garlic and onion can break down a dog's red blood cells, yet so many people continue to feed it to their pets. Don't get me started on the chocolate! I told a friend not to feed her dog grapes; she does it anyway. The vet told her to quit feeding her dog Del Taco French fries (or any fries); she does it anyway. Thank you for posting this list. There are plenty of people who actually love their dogs and will appreciate this information.