Find him when he's out of his yard and shoot him. Tell the cops you were in fear for your life.
That dog will attack your dog or you. Don't take the chance.
So far, he's been good about not leaving his yard. Last week some chihuahuas walked into his yard and my son was sure he was going to attack one so ran outside. The dog left them alone and went back to his own business after he saw my son run out.