Four mushers have scratched from the Kuskokwim 300 sled dog race in Alaska due to icy conditions. Race director Madelene Reichard said that the dogs were not used to running on ice and that the mushers wanted to keep their dogs healthy. The race, which started on Friday, has been rerouted into two overland loops of 140-plus miles between Bethel and Bogus Creek, a spot north of the hub community. The exact mileage won't be known until GPS tracking devices provide data, but it will likely be around 285 miles total. The race is expected to wrap up on Sunday morning.