Why is there a saying that "a dog bites Lv Dongbin"?

This actually comes from an allusion, in which the dog is not a real dog, but a scholar named Gou.

It is said that Lv Dongbin was actually a scholar before he became immortal. In order to gain fame, he is also a thorn in the side. He studies day and night, so he knows the hardships of scholars very well. Fortunately, I became a fairy. However, after Lv Dongbin became immortal, I once met my old friend Gou Kun.

Lv Dongbin inquired about Gou Jian's recent situation, only to know that Gou Jian had no way to continue studying because of family changes, so he had to write letters and copy books for a living. Lv Dongbin was very sympathetic to Gou Gou's situation, so he decided to subsidize Gou Gou to continue his studies. He bought a house for Gou Gou, left enough money to maintain his living expenses, and then he went to Xianyou. A few months after I came back, I found that the yard was covered with lanterns and colorful decorations. I was actually holding a wedding ceremony, and I found Sina incredibly embarrassed. Only after asking did I know that a famous family admired Gou Gou's intelligence and personality after learning about it, so they decided to marry him.

As a result, when Gou Gou was about to enter the bridal chamber, he was called out of the bridal chamber by Lv Dongbin, and then he went to the study next door to play chess all night, thus missing the wedding night. Lv Dongbin's original intention is not to indulge in being immersed in love with children, but to continue his studies and strive for early fame. However, Gou Kun did not know. He thought that Lv Dongbin was blaming himself for not studying hard but getting married first, so he began to blame Lv Dongbin for meddling.

That's why people say that dogs will bite Lv Dongbin. In fact, this is a short story, telling people to be grateful.