"Sergeant" Stubby, a stray Pit Bull Terrier, was the most decorated dog in US history. He was smuggled aboard a troop ship during WWI, and proudly served with the men of the 102nd Infantry in the trenches of France. He took part in four offensives and 17 battles. After he saved his regiment from a mustard gas attack, he was awarded a special gold medal by General Black Jack Pershing. Stubby was honored by three US presidents, and died of old age in 1926. (Photo compliments of Leatherneck31)