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Dogs’ faces evolved to improve human connection, study shows

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recently published their study in the Proceedings of the National Academy of Sciences. "Dogs were shaped during the course of domestication both in their behavior and in their anatomical features," the study’s authors said.

Scientists said they noticed that the muscle responsible for raising the inner eyebrow is present in dogs but not as much as in wolves, which they descended from, according to the study. RELATED: Help needed: Ukrainian zoo continues evacuations after shelling amid Russian invasionThat movement produces what many call "puppy dog eyes." Scientists said humans produce the same movement when sad, which can trigger a similar response in dogs to show empathy.

As part of the study, scientists compared and contrasted the facial features of gray wolves and domestic dogs. They found a difference in the levator anguli oculi medialis muscle immediately surrounding the eye.

Researchers said the muscle was more prevalent in dogs and they were able to control the movement with higher intensity compared to wolves.

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