The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Dogs sometimes fake being sick to get attention.
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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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Dogs can make about 100 different facial expressions.
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One in three dog owners say they have talked to their pets on the phone.
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Two dogs were among the Titanic survivors.
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