The Indigirka sled dog is the best in the North. In the 17th century the Russians called the Indigirka River the "Dog River" after its primary mode of transportation. These dogs are large, shaggy, with thick, high paws, a broad forehead, and sullen eyes. The Indigirka sled dog is known for its endurance and adaptability to very low temperatures. Height - 55-60 cm. Weight - 30-40 kg.