have you tried time outs? praise when he licks instead of biting? the second pup bites, he gets a timeout. A timeout consists of 10-15 seconds completely cut off from you aka behind a closed door. Bathrooms work well for timeouts but make sure there's nothing pup can get into. You can also work on licking instead of biting but using a stick of butter. Rub a little on the back of your hand, allow the puppy to lick the butter spot, praise for "kisses" and treat. Repeat. Enourage pleasant behaviors. Dont reward the bad.
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