It’s their “puppy dog eyes” that really help dogs melt our hearts – now we know they are created by a facial muscle that is lacking in the closely related wolf
Source:
https://www.newscientist.com/article/2206696-dogs-evolved-a-special-muscle-that-lets-them-make-puppy-dog-eyes/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home