I will go out on a limb and go the other way, it was not the dogs fault he felt like he was the dominate party. How many humans have done worse to a child and not been killed? How many mothers have killed their children and are free today? Call the shelter I have heard they have times when you can bring your pet in to be viewed people for adoption. It save the adopties the big fee and gives you a chance to "sell" your dogs good qualites. I had a friend do this and it went well. Put a sign up at the store or something, the dog does not deserve to die.