In call of the wild what exploit did buck accomplish that made John Thornton, jubilant

In "The Call of the Wild," Buck accomplished a remarkable exploit of pulling a thousand-pound sled loaded with half a ton of cargo for an incredible distance of one hundred yards. This remarkable feat of strength and endurance left John Thornton jubilant, amazed, and proud of Buck, as it showcased his exceptional power and adaptation to the harsh environment of the Klondike Gold Rush.