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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Dogs have been man's pet for over 14,000 years.
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Cats and dogs can hear ultrasound.
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