While some changes in mushing come from development in the sport, others have been forced by a changing climate. One part of the story is told in the DNA of the dogs.

For the sled dogs, the time change was a sudden shift ... Because, while you can teach an old dog a new routine, such an abrupt, overnight shift can be unsettling. Unless, of course, you Are ...

Mike Bestgen, a 66-year-old resident of St. Cloud, Minnesota, has been a competitive sled dog racer for over 25 years.

Mike Bestgen, a 66-year-old resident of St. Cloud, Minnesota, has been a competitive sled dog racer for over 25 years. Bestgen's dedication to the sport has earned him several victories ...