Dog owners convinced that their pup could convey a range of expressions through their eyes now have scientific evidence to back it up.
Researchers have discovered a key factor that separates wolves from dogs, involving two specialized facial muscles that evolved after they were domesticated by humans, according to a study published in the Proceedings of the National Academy of Sciences on Monday.
This movement resembles an expression humans produce when sad,"so its production in dogs may trigger a nurturing response," the study, which looked at both behavioral and anatomical data, states. Scientists hypothesize that the expressive eyebrows in dogs are the result of selection based on the preferences of humans.
Humans domesticated dogs more than 33,000 years ago, and as a result, they are able to read and use human communication in ways that other animals cannot, researchers said. Dogs are more skillful in using human communicative cues, like pointing gestures or the direction of a gaze, than even chimpanzees, which are human's closest living relative.
Dogs also seem to be motivated to establish eye contact with humans at an early age, which could be an indicator of the level of attachment between humans and dogs.
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