This is an important addition to the library of books looking at the history of dogs and dog's involvement with mankind. The author references a great number of useful historic sources along the way. He looks at the many different functions that dogs have fulfilled alongside man, and explores them in detail. It is a book that could easily have been published as 4 or 5 books, so the reader will not digest it in a sitting or two! He is, however, also a good writer, so the material is not dry, but good reading.