Perrault is a French Canadian dispatcher serving the Canadian government, partnered with his countryman François. During the Klondike Gold Rush, they acquire Buck for their Yukon sled dog team, immediately impressed by his physical power and potential. Perrault and François take Buck to Alaska for training in sled dog work. Their critical duty involves transporting official dispatches across the demanding Klondike terrain. Perrault possesses deep experience in handling sled dogs and a practical understanding of Arctic travel demands, demonstrating fairness and adaptability within the harsh northern environment. His dialogue, like François's, carries a distinct heavy French Canadian accent. Perrault privately judges Buck as "one in ten thousand," an exceptional animal due to his strength and rapid adaptation. After achieving a record-speed dispatch run on the Yukon Trail, Perrault and François receive new orders requiring their reassignment. Consequently, they sell their entire sled dog team, including Buck, to a Scotch half-breed mail carrier to continue the essential mail delivery service.