re the biting the person who recommended yelping is on the right track.
friends had a puppy that tore open their nose, ears and hands,(they foolishly let her sleep with them) and when she woke up she went for faces and lips
her dog was a terror,
the yelps she made once they decided to try it, were in direct intensity to the bites and the puppy stopped in her tracks, horrified she had hurt them. and then licked them as if to apologise
she stopped biting in days.
a real eye opener.