It s an incredible finding that suggests that dogs have hijacked the human bonding system, says Brian Hare, an expert on canine cognition at Duke University in Durham, North Carolina, who was not involved in the work. Hare says the discovery might lead to a better understanding of why service dogs are so helpful for people with autism and post-traumatic stress disorder. A finding of this magnitude will need to be replicated because it potentially has such far-reaching implications.

via news.sciencemag.org

It's easy to see how it could happen, isn't little chopilater, who's a little boonie, boonie, who's a little cookie cookie? Tummy rub! Tummy rub!