King Jian Zi (趙簡子 - BC?-BC 476) was leading a hunting party through Zhongshan when he came across a wolf.
King Jian takes aim with his bow and arrow but misses and hits a stone instead.
As the wolf makes its way through the forest he stumbles upon a traveling Mohist scholar Mr. Dongguo who is a kind young man (Chinese: 東郭先生; pinyin: Dōngguō Xiānshēng).
Mr. Dongguo takes pity on the creature and hides it in one of his book bags strapped to his donkey.
The donkey, upon hearing this, bolts from the scene as fast as its four legs to carry it leaving Mr. Dongguo behind with the wolf.
The buffalo tells its story of how it served its masters for many years dutifully providing him with milk and plowing his fields.
In classical Chinese literature, this tale is quite unusual in the fact that it is a fully developed animal fable.
The term Mr. Dongguo (Dōngguō Xiānshēng) has now become a Chinese idiom for a naive person who gets into trouble through being softhearted to evil people.
Leo Tolstoy in one of his "readers" for elementary school has a similar story, entitled The Wolf and the Farmer (Russian: Волк и мужик).