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 A dog named Laika was launched into space aboard a Russian spacecraft and became the first living mammal to orbit the Earth!
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Nose prints are used to identify dogs, much like humans use fingerprints.
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Dogs (and wolves and foxes) are descended from a small, weasel-like mammal called Miacis which was a tree-dwelling creature and existed about 40 million years ago.
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Border collies are the most intelligent breed of dog!
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Dalmatian puppies do not have any spots on them when they are born. They actually develop them as they get older!
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The only mammals that have prostates are humans and dogs!
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The Basenji dog is the only dog that is not able to bark! It's called the "Voiceless Dog" and many believe that it yodels!
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Dogs have sweat glands and only lighty sweat via the bottom of the foot and through the pads at the bottom of their paws!
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Dogs have been used as guards, hunters, draught animals, eyes for the blind, drug and explosive detectors, rodent controllers - and even weapons!
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The tallest dogs are the Great Dane and the Irish Wolfhound.
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Puppies ears remain sealed until about thirteen to seventeen days after birth!
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The average dog's mouth exerts 150 to 200 pounds of pressure per square inch. Some dogs can apply up to 450 pounds.
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 Dogs naturally have a wonderful sense of smell. They have many more sensory 'smelling' cells than a man's 5,000,000 while a dog has nearly 220,000,000! Some authorities estimate that some dogs sense of olfaction (smelling) is as high as 1 million times greater than ours.
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Dogs earliest domestication could have been 30,000 years ago!
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The dingo is not native to Australia but was introduced thousands of years ago by the first immigrants.
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The smallest dog in history was a tiny Yorkie from Blackburn, England.
At two years of age and fully grown this little dude was an incredible 2.5 inches tall by 3.75 inches long! He weighed only 4 ounces! He was approximately the size of a matchbox.
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The oldest dog that has been reliably documented was an Australian cattle-dog named Bluey. He was put to sleep at the age of 29 years and 5 months!
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Dogs, as we know them today, first appeared in Eurasia about 15,000 years ago, and a descendant of a small, grey wolf.
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Pixie, a Siberian Husky, gave birth to 7 puppies, one of which was bright green.
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