The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Meysi is one of the world's smallest dogs, measuring in at just 7cm tall, 12cm long, and weighing a meagre 250 grams (only slightly heavier than a hamster!)
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A puppy is born blind, deaf, and toothless.
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Cats and dogs can hear ultrasound.
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The Basenji dog is the only dog that is not able to bark.
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