My puppy (golden retriever) knows how to sit, lay down, and shake, thought only for a few seconds. She always bites me, and when I try to offer chew toys she ignores them. I know everyone says to always be positive when training, and to always reward them for everything they do right. Well, I've been doing that, but when I go to pet her head and say good job she just wants to bite my hand. The yelping thing doesn't work, she just does it again. I also don't know how to teach her not to jump up and to stay. I don't want her to get aggressive with all of her biting and barking when I punish her. All I want is for her to stop biting! Help!