Andy is a neutered 3 yr old chi/rat terrier. Since I let him in from outside about an hour ago, he is desperately chewing and licking at his penis. The whole tender part is hanging out as he is doing this. When he gets up to move it goes back in but he only takes a few steps then drops down and returns to chewing and licking almost ferociously. I have never seen this before and have no idea what to do to help.
