I have a Jack russell. When my partner tries to give me a kiss or a cuddle Rex ( the dog) thinks he needs to protect me, he doesn't. The strange this is it is me who he bites. He has bitten my toe so badly my 4th toe is broken and he broken the skin on the toe next too it. This dog is a rescue dog who thrown against a wall when he was a puppy. He has had a very bad start in life. He has responded to train from me . I do not want to put this dog down any help plz?