Amy, thankfully no. Never bit enough to break the skin, but left a mark. I don't think he's doing it intentionally to injure someone. It's just the reason of WHY he is doing that. WHY he does it without any warning. He is a good dog, but we need to get this issue fixed as soon as possible. I just do not trust him 100%, even though he's never tried anything with me. He knows better not to. I will have the vet to check his thyroid as well.