that are tough to resist. Now, research suggests evolution played a role in that irresistible gaze.
Dogs were domesticated more than 33,000 years ago and have changed over time to communicate with people, the study authors noted.look bigger and sadder, like humans can, according to Juliane Kaminski, a scientist at the University of Portsmouth in England, and her colleagues. For the study, Kaminski's team compared the anatomy of dogs' faces and those of wild wolves. They also compared the behavior of wolves and shelter dogs.
In dogs, the researchers found a muscle that raises the eyebrows, which wolves didn't have. The muscle in dogs pulls the corner of the eyelids toward the
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