That's sad man, I'm sorry to hear that. I think you may have mentioned this in one of our first pen-pal letters. If so, I apologize for not immediately recalling it. Dogs are such wonderful companions and they can be really fragile psychologically just like we can. He may not ever be like he once was but with some affection and a positive routine he may just get close. When our dog Hemingway was a puppy he ran off and went missing in the middle of a Michigan winter. We found him four nights later, miles from where he ran off and with a hind leg that was broken in three places. It definitely messed with him psychologically. He is VERY clingy now and emotionally needy. It's amazing you were able to get him back. Good luck with him, he's lucky to have you.