In the New World, wherever humans have gone, dogs have been their close companions. In this revelatory history, Mark Derr looks at the ways in which we have used canines - as sled dogs, sheepdogs, Seeing Eye dogs, guard dogs show dogs and more - as he tracks changes in American culture and society. Derr weaves a remarkable tapestry of heroism, betrayal, tragedy, kindness, abuse and unique companionship. The result is an enlightening perspective on American history through the eyes of humanity's best friend.