Gus, a black lab, plays with a tennis ball Nov. 8, 2013 in Washington while watched by Capitol Police Officer Chuck McGuire. Gus spent five years as an
Gus, a black lab, plays with a tennis ball Nov. 8, 2013 in Washington while watched by Capitol Police Officer Chuck McGuire. Gus spent five years as an explosives detection dog with the Marine Corps before Capitol Police Department's K-9 unit. (The Washington Post/Linda Davidson)