The Siberian Husky (Russian: Сибирский хаски, tr. Sibirskiy khaski) is a medium-sized working dog breed. The breed belongs to the Spitz genetic family. It is an active, energetic, resilient breed, whose ancestors lived in the extremely cold and harsh environment of the Siberian Arctic. William Goosak, a Russian fur trader, introduced them to Nome, Alaska during the Nome Gold Rush, initially as sled dogs. Nearly all dog breeds' genetic closeness to the gray wolf is due to admixture. However, several Arctic dog breeds show a genetic closeness with the now-extinct Taymyr wolf of North Asia due to admixture. These breeds are associated with high latitudes - the Siberian Husky and Greenland dog that are also associated with arctic human populations and to a lesser extent, the Shar-Pei and Finnish Spitz. These eye-color combinations are considered acceptable by the American Kennel Club.