In North America descendants of coyote (Canis latrans) had achieved the great success in struggle for existence. Coyotes had got the big advantage from the neighbourhood with people, having expanded the area and having got rid from wolf, their main competitor. Possible, in first time after human disappearance hybridization of coyote and descendants of domestic dogs took place; it had resulted in enrichment of genetic information of new species becoming ancestors Neocenic of North-American canids. Besides preservation of canids in Neocene was promoted by geography of continent. Prairies formed in “wind shadow” of Rocky Mountains, had continued the existence in Neocene. They became the house for swift-footed herbivorous mammals and “range” for occurrence of new species of canids. Among them