OH, how cute little guy. I would have to wonder what he has been through. He was not treated very well and he is very skittish until he knows you only what to love and treat him well. Give him time and love. We had a dog that was beaten and we have him time and love. He was great around us after almost a year, but do not let someone come to the door or by our house, He protected us. He was a special dog and we had him for several years.