Previously, the researchers had shown the eye connection between dogs and humans increases the levels of oxytocin in people. Oxytocin, aka the “cuddle chemical,” is a hormone mammals produce in the brain that encourages bonding between mothers and their offspring. It’s also involved in partner and social bonding.
Most evidence shows this kind of connection works within a species— humans produce oxytocin because of other humans, and dogs produce it because of other dogs.
But the new study is the first to show the hormonal bonding between dog and human.
That is, the feeling is mutual.