Four Thousand PawsFew sporting events attract as much attention, or create as much spectacle, as the Iditarod Trail Sled Dog Race. Each March, despite subzero temperatures and white out winds, hundreds of dogs and dozens of mushers journey to Anchorage, Alaska, to participate in "The Last Great Race on Earth," a grueling, thousand mile race across the Alaskan wilderness. While many veterinarians apply, only a small number are approved to examine the elite canine