ANCHORAGE, Alaska — The Iditarod, the annual sled dog race celebrating Alaska’s official state sport, got underway Saturday with a new focus on safety after five dogs died and eight were injured in collisions with snowmobiles while training on shared, multi-use trails. For the first time, mushers who line up for the competitive start Sunday will have the chance to snag light-up, neon harnesses or necklaces for their dogs before they begin the dayslong race that takes the dog-and-human sled…