Rescue is abt 2 years old. He starts nipping my hands, when I stop him he comes at me harder! When I stand up and tell him to sit - he jumps up and tries to bite me. I have him on a leash tethered to my waist. I put him in the crate for time out! He gets very upset and barks, whines, bangs the crate. I ignore him till he quiets (eventually). He is basically untrainable as he gets over stimulated. The trainer cannot get his attention. He was locked in a garage for about a year. His owner was deployed to Afghanistan and left the dog to his dad. Dad did not have time for him. No exercise, no socialization, no training - no neutering. I have neutered him. He walks pretty well on a leash most of the time. He just gets so aggressive trying to bite my hands. I have hand fed him, pet him. He knows hands are good. Playing turns to aggression and I don't know how to control it. He has destroyed two crates! I have to crate him or he destroys my house. He starts to play with the Labradoodle - then turns serious. I separate them! We rotate them. I am hoping that he clam down. he is on doggie downers for now. I am thinking about putting him into rescue as I really don't feel I am capable of working with him. He is so cute, I would love to keep him but I don't want to fail him. I was reading about the piraha dogs..... my Baby looks like one with a really big, blocky head.