Dogs have four toes on their hind feet, and five on their front feet.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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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 have been man's pet for over 14,000 years.
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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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