Dogs can pull at our heart strings with appealing facial expressions, and now we know why: they have more “fast-twitch” muscle fibres around their eyes and mouth, just like we do.
Dogs have muscles around their eyes and mouth that allow them to make facial expressions that appeal to humansDogs have evolved face muscles that move much quicker than those of their wolf relatives – which means their faces move in a way reminiscent of human ones. These faster facial muscles allow for better communication between dogs and humans and may help explain why people find dogs’ faces so appealing.
at Duquesne University in Pennsylvania. “They demonstrate this through their mutual gaze – that ‘puppy-dog eye’ look that they give us.”that wolves don’t have through human selection, which also helps them produce facial expressions humans find appealing.Now, in research presented at the Experimental Biology 2022 meeting in Pennsylvania today, Omstead and her colleague
For dogs and wolves, the pair counted the number of fast-twitch and slow-twitch fibres in the orbicularis oris muscle and the zygomaticus major muscle, which is around the mouth. They did this with muscle samples from seven dog species, including chihuahuas, huskies and Labradors, as well as grey wolves.
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