But there’s another impressive, long-distance sled dog journey worth considering: their slow motion race through time. A close look into canine genetics reveals sled dogs have been around and on the move for thousands of years. The findings reveal new insights into Greenland sled dogs’ spread and movement over millennia and also the accompanying human history. The research could prove critical to preserving healthy sled dog populations far into the future. In most cases, snowmobile or dog sled are the only means of overland travel between the various coastal enclaves.