O.K. Here's my 2 cents...
Mouthing definitely can be redirected to a toy but if a dog is biting then thats
I know I'm going to get comments about aggression getting aggression back but if Abbey snapped at me I'm positive I'd swat her across the nose.
In fact she did snap at my youngest over a bone she was told loudly NO swatted and lost her bone for the rest of the day.
And it worked, now before I get comments, I did not beat my dog nor did I swat her hard it was simply a matter of letting her know that those actions would not be tolerated at all.
Sorry but different strokes for different folks.