the biting is normal. They are called land sharks. They grow out of it. I redirected to a toy or a nyla bone.
When we got a puppy the older dogs would snap, growl or nip at him. It was not aggression. They are setting their boundaries. We just monitored it to ensure ot did get to rough.
Riley - 11/05/2012-8/30/2013 (Myasthenia Gravis)
He will always be in my heart.