For the first time, Iditarod competitors are being required to vaccinate all their sled dogs for "kennel cough," a highly contagious upper respiratory disease that troubled several teams in the 2011 race. In this video, four-time Iditarod champ Lance Mackey and former Yukon Quest champs Hans Gatt and Sebastian Schnuelle discuss how the bug hampered their dog teams. Anchorage Daily News video by Kyle Hopkins.

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