Diggity seems to go through several phases during the day. After she wakes up, goes potty, and comes inside, she is full of energy and playful. This is usually just playing with a ball or attacking a paper towel tube. But after a bit she gets WAY too excited and will bite anything near her. This could be fingers, clothes, or your face if you're close enough. Later she'll calm down a bit, play normally, and take a nap. Only to start over when she wakes up. Is this normal puppy stuff and how do we keep her "respectful" like she is when she's not in hyper-mode? We love playing with her but the kids are having a hard time with the biting.