First off, tell your friend to never EVER do this: "thwacking her nose, holding her down until she submits". Any dog with any iota of drive will resist, and likely fight back.You didn't mention if your friend has tried any of the following:Make a loud hurtful shriek as soon as the dog makes contact and immediately ignore for 10 seconds (no eye contact, turn head up and away, physically shift so that you are partially turned or turn your back on the dog).This is a puppy-to-puppy behavior that signals to the dog that the play or mouthing was too much.Afterwards, immediately return to playing and intentionally getting the dog excited. The game here is to show the dog that excitement and play is not equal to mouthing the human. Once the human is mouthed/bit, the playing abruptly stops. Jesse
She has done the shrieking and says it seems to excite her more, though I'm not sure she's added the deliberately exciting her further.
My understanding is that it's not just a coming home thing, it's a any time she wants to play or any time she's left the room and come back in. Which is ultimately a variation on the same behavior pattern.
It looks like you're new here. If you want to get involved, click one of these buttons!