When Lu Ji was young, he liked hunting very much and gained a good reputation in Dongwu. One day, the guest gave him a good dog named Huang Er. Lu Ji later became an official in Luoyang and often took it with him. This dog is very clever and can understand human language. Once, the dog was lent 300 miles away. The dog knew the way home and came back by himself. When Lu Ji was in Beijing, he didn't contact his family for a long time and jokingly said, "I have lost communication with my family." Can you deliver the letter for me and bring back the news from home? " The dog wagged its tail happily in agreement. Lu Ji wrote a letter, put it in a bamboo tube and tied it around the dog's neck. The dog ran along the post road to Wu Dong. When they are hungry, they will look for prey in the grass. Shake your head and tail at the ferryman as soon as you meet a big river. The ferryman loved him and told him to get on board. As soon as the ship landed, the dog flew ashore and ran like a fly. Until Lu Ji's home, he gave them instructions with a bamboo tube in his mouth. They opened the bamboo tube and took out the letter. After reading it, the dog said something to Lu Ji's family, as if he wanted something. They wrote a letter, put it in a tube and tied the dog's neck. The dog got the answer and ran back to Luoyang. People have been walking for more than 50 days, and the dog has only been back and forth for half a month. Later, when the dog died, Luji sent someone to send its coffin back to Soochow and buried it in the south of Luji's residence. 200 steps away from Lu Ji's home, the villagers call it "Huanger Tomb".

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