A big encyclopedia "Dog Breeds".

Dogs are the most volatile mammal on Earth. As a result of artificial selection, about 450 internationally recognized dog breeds have been obtained. These breeds have distinctive morphological traits that include body size, skull shape, tail phenotype, fur type and coat color. Their behavioral traits include guarding, grazing, and hunting, as well as personality traits such as hypersocial behavior, courage, and aggression. Today, dogs are the most abundant predator species and are scattered throughout the world.