Uno has become a biter! He was well socialized as a puppy but lately he has started running up behind people and biting their legs. Everyone has been nice about it so far but I really want it to stop. I can't stand the fact that he might seriously injure someone. Can anyone help me to stop Uno from biting? It could be because he is going blind in his only eye and just can't see people as well anymore but I just don't know.