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This is a fascinating and controversial book, which presents a new view of the evolution of the dog as a species in its own right, as opposed to being an inferior type of wolf. The authors use both their extensive experience as trainers, and draw on biological science to develop their theories. They examine the development of different breed types, such as herding dogs, and guarding dogs, and their suitability as companion animals. They also examine the nature-nurture debate, and how the interaction between the two is important for understanding dog behaviour. It helps to have some understanding of zoology to be able to follow all the arguments in this book, but you can enjoy it without being a specialist. You may not agree with everything the authors say, but this book will certainly give you new insights to help you get the best out of your dog.