Fanta, a U.S. Air Force military working dog assigned to the 51st Fighter Wing, barks during an exercise at Osan Air Base in Songtan, South Korea, June 20, 2011.
Military working dogs are trained to work with their handlers and perform duties that range from drug and explosive detection to patrol. (DoD photo by Senior Airman Evelyn Chavez, U.S. Air Force/Released). Original public domain image from Flickr