Coyotes have the face muscles for that ‘sad-puppy’ look
Domestic dogs’ big-eyed stare may not be the fruit of domestication

The coyote turns out to have the kind of face muscles famed for letting dogs (right) widen their eyes into the wistful puppy-dog look that captivate humans.
Jouko van der Kruijssen/Connect Images/Getty Images Plus (left); K.C. Alfred/Moment/Getty Images Plus (right)