Scientists take a peek behind those sad puppy dog eyes

By

National News

June 18, 2019 - 10:21 AM

NEW YORK (AP) — What’s behind those hard-to-resist puppy dog eyes?

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.

Today, pooches use the muscle to raise their eyebrows and make the babylike expression. That muscle is virtually absent in their ancestors, the wolves.

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