Brian Hare, assistant professor of evolutionary anthropology at Duke University, holds out a dog biscuit.
"Henry!" he says. Henry is a big black schnauzer-poodle mix--a schnoodle, in the words of his owner, Tracy Kivell, another Duke anthropologist. Kivell holds on to Henry's collar so that he can only gaze at the biscuit.
The Secrets Inside Your Dog's Mind - TIME