Help! My 11 week old male yorkie can be so sweet and calm! Although, at times he bites very hard and plays tooo rough! I am getting afraid that he is going to bite one of my kids! Is this normal behavior? I have to put him in his gated area and let him calm down. No one in our family has been playing and encouraging this behavior! Does someone have any suggestions on how to stop this!! I have been firm and walked away!