I have a shih tzu puppy. She's only 3 months old. I believe she's only bitting me because she's still so playful at her age. Or maybe she misses me a lot because she's often left at home alone. I love her so much that's why it hurts me bad to keep her in the cage. I want her to run freely in the room but it annoys me when she bites me. Cause it hurts. Please help me. What should I do to stop her or to train her not to bit me anymore. Thank you