Chow Chows are born with pink tongues, which turn blue-black at 8 to 10 weeks.
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The average dog can run about 19 mph. Greyhounds are the fastest dogs on Earth and can run at speeds of 45 mph.
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Male dogs have a bone in their penis.
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About one-third of a dog’s brain is dedicated to smell.
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U.S. Customs dogs "Rocky" and "Barco" were so good at patrolling the border that Mexican drug lords put a $300,000 bounty on their heads.
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Dogs can use their sense of smell to gauge our emotions, they can smell fear, anxiety, even sadness. This is because they can smell hormones such as adrenaline.
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Female dogs are only ready to mate–"in heat"–twice a year for a total of roughly 20 days.
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Dogs like to chew bones but cooked bones and bones that can splinter such as cooked chicken bones should not be given to dogs.
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Move over Rover! 45% of dogs sleep in their owner’s bed (we’re pretty sure a large percentage also hog the blankets!)
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Chocolate contains a substance known as theobromine (similar to caffeine) which can kill dogs or, at the very least, make them violently ill.
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The most popular breed of domestic dog in the US and the UK is the Labrador Retriever.
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A dog most likely interprets a smiling person as baring their teeth, which is an act of aggression.
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The world's smallest dog was a Chihuahua named Miracle Milly, who weighed only 1.1 pounds.
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A dog's sense of smell is so powerful that they can detect drugs and explosives.
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The ancient Mbaya Indians of the Gran Chaco in South America believed that humans originally lived underground until dogs dug them up.
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