when I was a kid I would stay a week every yr at my dads friend's who raced the iditarod she raised tons of dogs and lived deep in the woods buy sheep creek.
the dogs all had there own big wood wire spool with a hole in it for a house.
I would hook up a team and hook them up to a old honda atc and run them hard till they got hot and then would start the atv and and run them without a load.
it is crazy how fast a team can go.