There was an article in National Geographic a few years ago that explained the bond between Humans and Canines. It's origin is pre-historic!! There have been the remains of canines found in digs that date back thousands of years all over the world, to include North America. They go on to explain that it is believed to be a Genetic Imprint that was developed over centuries upon centuries of close contact.
I'll look on the net for a link to the article, it was most interesting!!
Found it:
http://ngm.nationalgeographic.com/ng...0020101.1.html
Also, try Googling National Geographic Canine..................there are more!
Later
Martin