A military working dog

Ali,a military working dog,is restrained by his handler, U.S. Air Force Staff Sgt. Dustin Weeks, left, as he attacks U.S. Navy Seaman Andrew English, a military working dog handler, during military working dog training at Al Asad Air Base, Iraq, July 25, 2010. English is deployed from Naval Air Station Key West, Fla. (DoD photo by Senior Airman Perry Aston, U.S. Air Force/Released)