FOREST GROVE, Ore. -- A man walking his dog fended off three drunk attackers by firing a shot from his revolver early Wednesday morning, police said. Forest Grove investigators said 55-year-old John McKnight was walking his dog just after midnight on Elm Street near Rogers Park when three drunk men started harassing him. McKnight said he drew his .38 from a concealed holster and told them to back away. One man told McKnight he thought the gun was unloaded and attacked, choking McKnight and biting his index finger, according to police. McKnight was able to fire a shot into the air. Police soon found 21-year-old Michael Ryan and arrested him for assault, strangulation and disorderly conduct.