The love affair between dogs and snow goes way back. The very first sled dogs were thought to be around the north migration of the Arctic Circle over 25,000 years ago. Interestingly, the use of mixed-breed sled dogs actually pre-dates breeding specific sled dog breeds like the Husky. Throughout the development of the Alaskan Gold Rush and the exploration of the poles in the late 1800s, sled dogs were used so often that the late 1800s and early 1900s is sometimes referred to as the "Era of the Sled Dog." Today, the tradition is kept alive in Alaska and celebrated every year with the Iditarod, a race along the 1,100 mile long Iditarod endurance trail in Anchorage, Alaska. The race draws in competitors and spectators from around the world.