Hi, we just got our puppy and we love her already and we would really appreciate some help with our almost 5 month old pit bull female puppy, Beauty.
We took her from a friend of friend who could not keep her because of her moving. We didn't get background info on her except that the lady's father had the litter of pups.
We've had her for 12 days and have taken her to one basic training class. We started using a prong collar on her for walks 4 day's ago at the training class (after a week of having her pull us all over with a flat collar). She caught on very quickly (same day) and will heel with very little correction.
Two days ago she started playbiting that turned into growling, lunging and jumping at us unprovoked. Today I stood in one room and she cornered me and would not stop jumping and trying to bite my hands, biting at my crotch and growling. Just a few minutes before in the kitchen she had started and i got her to sit and lay down. The only way I got her to stop was to grab her collar. We are trying to understand her. She has bitten my hand, but not bruised or torn the skin. We've tried to say "ow" when she plays too rough and leave the room, but she chases after us still jumping and repeats. Once when I looked at her and said "ow" she stopped for a moment and then growled and lunged again.
We want to find out what to do - one moment she's an eager to please pup sitting, laying, shaking paws with us for praise and treats and the next she's what we think is aggressive towards us but we want some help determining if this is serious or she needs training to teach her how to act around people. Her growling and lunging at us without stopping and advancing on us is frightening.
Does anyone have an idea what to do? We want to work with her and train her. We don't know how to judge her behavior or what to think.

