Striker, a U.S. Department of Agriculture brown tree snake detector dog, rests after play time with his handler April 30, 2015, at Andersen Air Force Base, Guam. A minimum of 30 minutes of daily play time is required in order to foster the relationship between handler and dog as well as burn off the dog’s excess energy. (U.S. Air Force photo by Senior Airman Katrina M. Brisbin/Released)