Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
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Dogs have four toes on their hind feet, and five on their front feet.
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Cats and dogs can hear ultrasound.
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Two dogs were among the Titanic survivors.
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The Basenji dog is the only dog that is not able to bark.
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