Uses simple text and color photographs to show how Rena, a dog, and Roo, a burro, develop into guardian animals on a sheep ranch in Wyoming.

How well do you know our favorite furry companion? Did they really descend from wolves? What's the difference between a Chihuahua and a Saint Bernard? And just how smart are they? Join one friendly mutt on a journey to discover the secret origin of dogs, how genetics and evolution shape species, and where in the world his favorite ball bounced off to.