Rule 19 -- Driverless Team: A team and driver must complete the entire race trail including checking in at all required locations. A driverless team or loose dog may be stopped and secured by anyone. The driver may recover his/her team either on foot, with assistance from another musher or mechanized vehicle and continue the race. Motorized assistance must be reported to an official at the next checkpoint. If mechanized help is used and advantage has been gained, the race marshal may impose appropriate sanctions.
Т.е. как и в любых правилах, машер должен догнать свою упряжку либо сам, либо воспользовавшись помощью другого машера или даже моторизованным средством.