The only dog to be promoted to the rank through combat, Sgt. Stubby served in the trenches in France, warning soldiers of incoming shells, gas attacks, and locating wounded soldiers on the battlefield. In one instance he captured a German spy singlehanded.
Cpl. John Robert Conroy took Stubby at Yale where the soldiers were training. Conroy then snuck Stubby with him to France when the troops shipped out. After the two survived a gas attack by the Germans, Stubby developed a keen smell for gas and would alert the men to incoming attacks since he could smell it long before a human could. He received multiple medals, met 3 Presidents, and became the official mascot of Georgetown University after the war. Sgt. Stubby was with Conroy when he died in 1926.