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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The Basenji dog is the only dog that is not able to bark.
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When cats are happy, they may squeeze their eyes shut.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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