When climbing up, the dogs pull up the sled and the musher pushes also. It is not only a job for the dogs. They have to carry some equipment for survival and the sled is not light. They have Sleepless nights, for they must hurry for good position. The temprature is down at night which is good for keep running (dogs can keep their temperature low), but the Musher must also save the dogs for reaching the finish line.
© Daisuke Tomiyasu