The author of Seven Daughters of Eve returns with a lively account of how all dogs are descended from a mere handful of wolves. How did wolves evolve into dogs? When did this happen, and what role did humans play? Oxford geneticist Bryan Sykes used the full array of modern technology to explore the canine genetic journey that likely began when a human child decided to adopt a wolf cub thousands of years ago. In the process, he discovered that only a handful of genes have created the huge range of shapes, sizes, and colors in modern dogs. Providing scientific insight into these adaptive stages, Sykes focuses attention on our own species, and how our own evolution from (perhaps equally aggressive) primates was enhanced by this most unlikely ally. Whether examining our obsession with canine purity, or delving into the prehistoric past to answer the most fundamental question of all, "Why do we love our dog so much?," Once a Wolf is an engaging work no dog lover or ancestry aficionado should be without.