This month's National Geographic has an amazing story on dogs and how, from a genetic and DNA standpoint this same species evolved into the almost 400 breeds recognized today. Here's the story link: http://ngm.nationalgeographic.com/2012/02/build-a-dog/ratliff-text And here's a fast and fascinating fact: OUR breed, the noble greyhound, has an enormous amount of "Herder" characteristic DNA (herders? our couch potato best friends??) which most likely indicates that greyhounds were used extensively in the creation of the herding breeds. Great article and photos and I highly recommend this!