Wherever humans have gone in the New World, dogs have been their companions, from the time people crossed the Bering Land Bridge some 20,000 years ago. In this revelatory history, Mark Derr looks at the ways in which we have used canines --- as sled dogs and sheepdogs, hounds and Seeing Eye dogs, guard dogs, show dogs and bomb-sniffing dogs --- as he tracks changes in American culture and society. In A DOG’S HISTORY OF AMERICA, 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.