Ok my baby is 9 weeks old and when he plays with our black lab he sounds so mean. Is this normal for a pup his age or should i be concerned that this is the start of something bad to come? He seems soooo sweet as long as he is not playing. But once he starts playing he seems mean. Even when we were outside the other night, my 3 year old son had a frisbee and Chance wanted it so he jumped up and bit him on the arm to get it. How do i get this under control before it gets worse?