Do Dogs Know That We're Suckers For 'Puppy Dog Eyes'? Unlisted Video

According to new research, dogs may have evolved the muscles around their eyes to capitalize on our preference for big-eyed, child-like faces. Mother Nature Network reported that researchers compared the anatomy and behavior of dogs to wolves over thousands of years and they discovered that muscles in the face were similar except for one thing. Unlike wolves, dogs have a very small muscle that lets them dramatically raise their inner eyebrow.