Glad you are trusting your gut and finding another trainer. In the meantime, you might find it effective to ignore the pup when he begins to bite. Turn away for a few seconds, then turn back. If he bites again, get up and walk away. You may see a brief increase in his biting to try and get the attention he's used to. But he will soon figure out that biting means the end of play time.
__________________  Don't get your knickers in a knot. Nothing is solved and it just makes you walk funny. |