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Scientists take a peek behind those sad puppy dog eyes

Updated : June 18, 2019 04:23 PM IST

New research suggests that over thousands of years of dog domestication, people preferred pups that could pull off that appealing, sad look. And that encouraged the development of the facial muscle that creates it.
The researchers believe dogs, over their relatively short 33,000 years of domestication, used this eye muscle to communicate, possibly goading people to feed or care for them.
Scientists take a peek behind those sad puppy dog eyes
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