Dogs, But Not Wolves, Use Humans As Tools | Science News | Scoop.it
From blogs.scientificamerican.com - May 2, 2012 6:38 PM

It is probably no accident that the relationship between dogs and their owners mirrors the attachment relationship between parents and their children, behaviorally and physiologically. Indeed, humans who have strong bonds with their dogs have higher levels of oxytocin in their urine than those with weaker bonds.