Scientists take a peek behind those sad puppy dog eyes

by JEREMY REHM Associated Press

Mon, June 17th 2019, 7:20 PM UTC

FILE - This Feb. 18, 2014 shows Lexy, a therapy dog at Fort Bragg, N.C. A study released on Monday, June 17, 2019 suggests that over thousands of years of dog domestication, people preferred dogs that could pull off the ”puppy dog" eyes look. And that encouraged the evolution of the facial muscle behind it, researchers propose. (AP Photo/Alex Sanz, File)

This diagram provided by Tim Smith in June 2019 shows a comparison between dog and wolf facial muscles. A study released on Monday, June 17, 2019 suggests that over thousands of years of dog domestication, people preferred dogs that could pull off the ”puppy dog" eyes look. And that encouraged the evolution of the facial muscle behind it, researchers propose. (Tim Smith via AP)

FILE - In this Wednesday, Jan. 30, 2013, file photo, a Labrador retriever named Shayna attends a news conference at the American Kennel Club in New York. A study released on Monday, June 17, 2019 suggests that over thousands of years of dog domestication, people preferred dogs that could pull off the ”puppy dog" eyes look. And that encouraged the evolution of the facial muscle behind it, researchers propose. (AP Photo/Seth Wenig, File)

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FILE - This Feb. 18, 2014 shows Lexy, a therapy dog at Fort Bragg, N.C. A study released on Monday, June 17, 2019 suggests that over thousands of years of dog domestication, people preferred dogs that could pull off the ”puppy dog" eyes look. And that encouraged the evolution of the facial muscle behind it, researchers propose. (AP Photo/Alex Sanz, File)

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