The comprehensive book on humanity's most loyal companion: history, biology, and behavior. A richly illustrated reading pleasure featuring portraits of 32 popular dog breeds. The story of a unique relationship began more than 15,000 years ago - the friendship between humans and dogs. The dog serves as a working animal for humans - whether as a herding or guard dog, drug detection dog, guide dog, or hunting companion - but it is also a faithful friend. Ultimately, the dog is simply a dog - a descendant of the wolf. This book examines the dog from various perspectives. It not only describes the background of its evolution and domestication but also provides a wealth of information on biology and behavior, sensory abilities, and skills. It also sheds light on the human-dog relationship: how dogs can be socialized and trained.