Dogs can make about 100 different facial expressions.
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Two dogs were among the Titanic survivors.
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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Service dogs are trained to know when they are on duty. When their harness is on, they know they are at work. When you take it off they instantly become playful and energetic.
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