As far as the treats try dehydrated treats such as beef liver. All natural no additives , the biting I curbed with listerine for both of mine duke was a little more hard headed he seemed to like the taste. Run listerine on whatever he isn't suppose to chew such as your arm then on his tounge say no and redirect to a toy- kinda inconvenient cause you have to have listerine near by to catch him in the act but believe me it works. The bumps sound like an allergic reaction to something- I use to wipe duchess off with hypoallergenic baby wipes and they would give her bumps so I stopped using them and just use a damp washcloth. I start brushing from day one to get them use to it. Good luck getting him not to drink the bath water- lol.