Hi! I don't know what to tell you about how to get your boy to stop biting the new puppy. We had the same problem when we brought our pup Dexter home and eventually they worked it out. We had a careful eye on them and if Dex was playing too hard we would separate, especially if we could tell the other was about to go nuts. At 3mos old all they want to do is play and bite everything that moves, and even those that don't
Eventually they will realize that neither of them are going anywhere and at the very least they will tolerate each other. Sorry I can't offer more than that, I'm sure someone much smarter than I about this sort of thing will give you some good advice
