Sergeant Stubby In 1917, a stray dog snuck onto a US troop ship. He went to France with the 102nd Infantry. He smelled mustard gas before humans could. He once bit a German spy and held him by the pants. The Army promoted him to sergeant. He outranked his owner.
Source
Smithsonian Magazine, 2014, 'Sergeant Stubby: The Dog Who Went to War'
Spot an error? Email hello@thefact5.com with a source — we correct visibly.