He no longer growls or tries to bite her. We spoke with the behaviorist/trainer over the phone this morning and she told us to flip the puppy on this back and tell him to be nice (trainer mentioned how important it is to make sure that he knows he is not the dominant one)…it only took 1 time of doing this before he let my mother-in-law pet him.
Did the trainer indicate what you should do when he gets bigger?? I'm not sure I'm totally on board with this method. If he encounters somene other "new" person and he's a lot older you will not be able to easily flip him on his back & might actually get bitten in your attempt to do so.
I would have much rather seen some advice that was centered on helping the dog get comfortable with the new situation with positive praises & rewards.
Just my 2 cents