[Casey Jones]

I too would be concerned with this behavior from a 12 week old puppy! I'm certainly no expert, but I'd say that the puppy sees herself as higher up in rank than your wife. I'd look up NILIF and have your wife work with the dog. You too, but mostly your wife. Thank god this happend now and not when she's 80+lbs.

and like moondog said, it's really not a good idea to force any dog on its side or back.