Hello !! Okay so im always playing with my puppy (dexter) but hes started to bite alot, even on my face.! My partner said to smack him on the nose but i was told not too, so i just say no and ignore him. I know hes teething but how do i get to learn not to bite. Hes a smart pup as we have taught him so much already and he picks it up so fast.. I just must be doing it wrong. Please help