I recommend the following article about human/canine co-evolution and why we humans flaunt the whites of our eyes.
Our species may owe a giant debt of gratitude to our four-legged best friends. aldai.ly/JyHJPI—
Arts & Letters Daily (@aldaily) June 03, 2012
See also “Dogs can read emotion in human faces“. By the way, left-gaze bias is a reason why you look so different in a video than you do in a mirror.
“A mutation that causes white sclerae like those of humans has occasionally arisen in chimpanzees, but it has not spread in that species.” Photo by Geza Teleki via American Scientist.