Yes. Never feed chocolate to your pet – chocolate contains a substance which is toxic to your dog (and cats as well). Onions are also dangerous to your pets health and in large amounts can cause anemia by destroying the red blood cells. Avoid feeding table scraps to your dogs, as they are not nutritionally balanced and can lead to poor skin coat, allergies, dietary intolerance, obesity, or even poisoning your dog. Behavioral problems such as begging from the table, disobedience and refusal to eat their normal food are also problems that can result.