The evolution of dogs and the forces that drove its amazing transformation from a fierce wild carnivore, the wolf, to the astonishing range of comparatively docile domesticated dogs that we know today. Sykes paints a vivid picture of the dog as an ancient and essential ally. While undoubtedly it was the mastery of fire, language and agriculture that propelled Homo sapiens from a scarce, medium-sized primate to the position we enjoy today, Sykes crucially credits a fourth element for this success: the transformation of the wolf into the multi-purpose helpmate that is the dog....