Fun fact: Dogs developed whole extra sets of facial muscles during their domestication: https://www.theatlantic.com/science/archive/2019/06/domestication-gave-d

Fun fact: Dogs developed whole extra sets of facial muscles during their domestication: https://www.theatlantic.com/science/archive/2019/06/domestication-gave-dogs-two-new-eye-muscles/591868/ https://www.theatlantic.com/science/archive/2019/06/domestic... This happened in a remarkably short period of time, and the running theory is that early dogs with more expressiveness were better cared for and received by human societies than similar dogs that were less expressive.