Okay.... I hear that they bite and I hear that it hurts
But why are you letting him Bite You
This is a problem that is relatively easy to fix and VERY important to stop
before it becomes entrenched in their behavior
WHENEVER they bite it's NO BITE! and your hand your arm ... in fact YOU
go away
You do give them a chance to bite again
This does two things
It tells them All Play stops when they bite and they are left alone when they cross that boundary
Puppies live for your attention ... don't give it to them when they misbehave