Hi, My yorkie loves to play that way too but he doesn't bite hard enough to hurt. He bites at ours and visitors feet which isn't always appreciated and one of my son's friends is quite frightened of him. Pip is a loving dog but yesterday I bought some clippers because the groomer is scared of him too !! When you have had your yorkie for a while you will get to know each other I am sure and will have a great relationship. Pip is definately a mummies boy and I love him to bits. Congratulations on getting your new little one.