This is in chapter 2
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Buck is shocked because in his memory buckles (harnesses) were reserved for horses, working horses.
François fastened upon him an arrangement of straps and buckles. It was a harness, such as he had seen the grooms put on the horses at home. And as he had seen horses work, so he was set to work, hauling François on a sled to the forest that fringed the valley, and returning with a load of firewood. Though his dignity was sorely hurt by thus being made a draught animal, he was too wise to rebel.
Call of the Wild