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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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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The CIA once spent $20 million on a cat equipped with gear to spy on the Soviets, but it was hit by a taxi.
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