A dog breed is a specific type or variety of dog that has been bred and developed for certain characteristics, traits, or functions. Dog breeds are typically categorized by their purpose such as hunting, herding, guarding, or companionship. Breeding dogs with similar physical and behavioral attributes over many generations can result in a distinct breed with its own unique appearance, temperament, and abilities. Some popular dog breeds include Labrador Retrievers, German Shepherds, and Golden Retrievers among others.