Compare the petite Chihuahua with the daunting Great Dane, or the lithe greyhound to the poofy Pomeranian. Many scientists agree that the domestic dog displays more morphological variation than any other known species, thanks to selective breeding by humans. But dog breeds differ in more than their outward appearances. A new study suggests that human preferences have dramatically altered the structure and position of the brain in certain dog breeds, potentially modifying their sense of smell and behavior as well. [More]
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