<div><BR>I have read from many different sources that onions are toxic for dogs. I wouldn't think that one occurrence would cause damage (unless it was a tiny dog and a giant onion) but I definitely wouldn't feed my dog onions on purpose. I'd be really scared that it could cause "toxic buildup"in the body. </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div> <div> </div><p>