Iditarod Trail Sled Dog Race spruce log with two distinct burls similar but not identical to the old arch. While the old arch spelled out "End of Iditarod Dog Race", the new arch has an additional word: "End of Iditarod Sled Dog Race". A "Widow's Lamp" is lit and remains hanging on the arch until the last competitor crosses the finish line. The tradition is based on the kerosene lamp lit and hung outside a roadhouse, when a musher carrying goods or mail was en route. The last musher to complete the Iditarod is referred to as the "Red Lantern". On the way to the
Sled dog Greenland, Siberia, Chukotka, Norway, Finland, and Alaska. In 2017, a study showed that 9,000 years ago the domestic dog was present at what is now Zhokhov Island, arctic north-eastern Siberia, however this area was connected to the mainland then. The dogs were selectively bred as either sled dogs or as hunting dogs, which implies that a sled dog standard and a hunting dog standard existed at that time. The optimal maximum size for a sled dog is 20–25 kg based on themo-regulation, and the ancient sled dogs were between 16–25 kg. The same standard has been found in the remains