The term COMMAND TO A SLED DOG can be summarized as the word 'MUSH', which is a four-letter command used to direct a team of sled dogs. The term originated in the late 19th century and is believed to have been derived from the French word 'marche' or the German word 'marsch', both of which mean 'MARCH'. The term is used to encourage the dogs to move forward, and is often accompanied by a whip crack or other sound to further motivate the animals.