For most mushers, even completing the Iditarod aka the Last Great Race On Earth, is a big achievement. But don't tell that to Mitch and Dallas Seavey. They have dominated the thousand-mile sled dog race across Alaska for the last four years. 28-year-old Dallas, who took top billing in 2012 and 2013, was once again the first to cross the finish line in Nome at 4.13 am on Wednesday March 18th.