Poor baby and poor you! Buddy acted like that as a pup. He would eat everything and bite me when I tried to retrive it from him. Actually I was starting to be frightened of him and deceided that was crazy! Maybe you just have to start from scratch since it does not appear he has had any kind of socializing. Just start like he was a puppy and go from there. I am sure this should work. He knows nothing so has to learn like he was 3months old. Hang in there. Your special for rescueing him. Once he knows love and trust he will give it back.