Foods your dog should never eat: Onions

Onion in all forms - powdered, raw, cooked, or dehydrated - can destroy a dog's red blood cells, leading to anemia. That can happen even with the onion powder found in some baby food. An occasional small dose is probably OK. But just eating a large quantity once or eating smaller amounts regularly can cause onion poisoning. Symptoms include vomiting, diarrhea, little interest in food, dullness, and breathlessness.

Web MD