Sulimov Klim Timofeevich, Candidate of Biological Sciences, leading researcher at the Russian Research Institute of Cultural and Natural Heritage named after. D. S. Likhacheva, member of the scientific coordination council for domestic dog breeds of Russia. Scientific consultant of the canine monitoring department of Aeroflot PJSC. The material prepared by K. T. Sulimov in the field of general and applied canine science represents his own comments on two alternative theories the origin of the domestic dog, to fragments of the history of domestic dog breeding, remarks and reflections on the topic of breed standards and the practice of field testing of hunting and working dogs of the second half of the 20th century, on the unconventional use of natural breeds and the prospects for breeding new ones in the present and foreseeable future. The problems of the so-called ownerless mongrels. A significant part of the book is devoted to a critical examination of the breed characteristics of the main domestic breeds and offspring of domestic breeding, the functional features of the main articles of the dog and its behavior. It can serve as a guide for studying the formation of breeds, their transformations in the conditions of the domestic dog breeding culture.