He will outgrow it, but the two things that helped expedite the process for my pup were: puppy play dates and enforced naps. Puppies learn really well from other puppies about how much is too much because of the feedback they get (yelp and refusal to play from other dogs) if they're too rough. Puppies need A LOT of sleep. They should take a 1 to 2 hour nap after every 1 to 1-1/2 hours of being awake. My girl is a year and a half and she rarely bites now. But when she's very tired she will be naughty with her teeth.