Read it through once

Late next morning Buck led the long team up the street. There was nothing lively about it, no snap or go in him and his fellows. They were starting dead weary. Four times he had covered the distance between Salt Water and Dawson, and the knowledge that, jaded and tired, he was facing the same trail once more, made him bitter. His heart was not in the work, nor was the heart of any dog. The Outsides were timid and frightened, the Insides without confidence in their masters.