Dog Day Shake Defense Secretary Ash Carter shakes hands with Pvt. Truman, a working dog assigned to Walter Reed National Military Medical Center in Bethesda, Md., at the Pentagon, Aug. 26, 2016, to recognize National Dog Day. DoD photo by Navy Petty Officer 1st Class Tim D. Godbee SHARE: Download: Full Size (1.53 MB) Credit: Navy Petty Officer 1st Class Tim D. Godbee VIRIN: 160826-D-SK590-846D.JPG Photo Gallery