The Siberian Husky is a medium to large, dense-coat working dog breed that originated in north-eastern Siberia. The breed belongs to the Spitz genetic family. It is recognizable by its thickly furred double coat, sickle tail, erect triangular ears, and distinctive markings.Huskies are an active, energetic, and resilient breed whose ancestors came from the extremely cold and harsh environment of the Siberian Arctic. Siberian Huskies were bred by the Chukchi of Northeastern Asia to pull heavy loads long distances through difficult conditions. The dogs were imported into Alaska during the Nome Gold Rush and later spread into the United States and Canada. They were initially sent to Alaska and Canada as sled dogs but rapidly acquired the status of family pets and show dogs. Because of their efficiency as a working breed, most huskies are bred to be able to withstand long work days on little amounts of food.A Siberian Husky's coat is thicker than most other dog breeds comprising two layers: a dense undercoat and a longer topcoat of short, straight guard hairs. It protects the dogs effectively against harsh Arctic winters, but the coat also reflects heat in the summer. It is able to withstand temperatures as low as −50 to −60 °C The undercoat is often absent during shedding. Their thick coats require weekly grooming. In hot areas a husky's coat can naturally change so the dog can adapt to hot temperatures.Siberian Huskies come in a variety of colours and patterns, usually with white paws and legs, facial markings, and tail tip. The most common coats are black and white, then less common copper-red and white, grey and white, pure white, and the rare "Agouti" coat, though many individuals have blondish or piebald spotting. Striking masks, spectacles, and other facial markings occur in wide variety. Merle coat patterns are not allowed.