Working Dog Demo Canto, a military working dog, jumps toward Army Pfc. Patterson, who plays the role of an aggressor during a military working dog demonstration at Fort Meade, Md., Aug., 2, 2016. DoD photo by EJ Hersom SHARE IMAGE: Download Image: Full Size (1.02 MB) Tags: Soldiers, Army Photo By: DoD photo by EJ Hersom VIRIN: 160802-D-DB155-003C.JPG Photo Gallery