I have brought a boxer puppy into the home and my boxer really is not accepting him. He growls when he walks passed him which is fine I can deal with that. Yesterday in the garden puppy walked up to my boxer and he went ballistic, pinned puppy down and was trying to bite him. I have not let puppy run free around him since in fear he wil attack him again. I do bring pup into the same room and he is fine as long as puppy doesn’t go anywhere near him. Any help would be greatly appreciated please.