Sasha is now 13 weeks old and has a terrible problem of biting. I know she just wants to play, but it's totally unacceptable. She isn't showing any aggression when she does it. Quite the opposite in fact. If we are out walking and someone stops to pet her, she will sit there nice and let people touch her without any problems. She has never done it out on a walk. Especially kids, when they pet her, she is great (I always warn the parents that she is a puppy and does nip). In the house though, it doesn't matter who it is, she will nip at them constantly. It's to the point I have to put her up any time anyone is over, or she will just spend hours trying to bite them. If she is sitting there waiting for you to pet her, as soon as you do, she will try and bite. Any suggestions on how to stop this? It has to stop because it's completely unbearable. Someone comes over to meet the nice puppy and they leave thinking it's a hellish dog because the dog just spent half an hour biting them constantly. I am currently looking for obedience classes, but none seem to be starting any time soon.