Cats and dogs can hear ultrasound.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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