i have a 9 week old miniture bull terrier pup who likes to bite our 8 year old english masstiff (she is only playing) ,he growls at her but she takes no notice of him ,how do i get her to stop biting at him, he will lay with her if she doesnt bite him,i do stay with them when he is laying down,iam worried that he may bite and if so he will eat her but i do want to get them together ,she has been with us for three weeks now . brutus is not the problem it is piglet. ;)