The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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Dogs have four toes on their hind feet, and five on their front feet.
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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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George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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