What bug is the yellow dog in Wang Anshi's poem "The bright moon cries and the yellow dog lies in the flower heart"?

According to legend, Su Dongpo, a great writer in the Northern Song Dynasty, was demoted to Huangzhou, Huizhou and Danzhou for wrongly correcting Wang Anshi's poems, and finally moved to Lianzhou.

It is said that one day at noon, Su Dongpo went to the Prime Minister's office to pay homage to his teacher Wang Anshi. It happened that Wang Anshi had a lunch break, so Su Dongpo was not disturbed, so he waited in Wang Anshi's study, and there were two poems written by Wang Anshi on a clever desk. Among the poems, there were three sentences: "Blowing yellow flowers everywhere", "The bright moon cries" and "The yellow dog lies in the heart of flowers".

Su Dongpo shook his head and said to himself, Teacher, you're crazy. How can yellow flowers (chrysanthemums) fall off their petals? How can the moon crow, and the yellow dog can't sleep in the flower heart. Su Dongpo thought that Wang Anshi's two poems violated the real life, so he picked up a pen and wrote "Autumn flowers (chrysanthemums) are not as good as spring flowers next to Wang Anshi's poem" Blowing yellow flowers and gold everywhere ",saying that they should be sung carefully with the poet." This means that chrysanthemums are petal-free, which is different from other petals-free flowers. I hope the poet will think it over. He changed the phrase "the bright moon branches call" to "the bright moon branches hang". He thought that the moon would not call, and the rising moon just hung on the branches. Finally, the phrase "yellow dog lies in the flower heart" was changed to "yellow dog lies in the flower shadow". He thought that yellow dog could not sleep in the flower heart, but only under the flower shadow. After Su Dongpo changed Wang Anshi's poems, Wang Anshi went home before he got up. After Wang Anshi's lunch break, he came to the study and saw that his poems had been revised by Su Dongpo. He shook his head and said, "Too conceited, you must teach him a lesson." So Su Dongpo was banished to Huangzhou. After Dongpo arrived in Huangzhou, he saw that the chrysanthemums in Huangzhou were petal-fallen, and he realized that he had corrected Wang Anshi's poem "Blowing down yellow flowers and spreading gold everywhere".

Soon, Su Dongpo was banished to the distant and desolate Danzhou. In Danzhou, he saw a bird chirping in the tree every night, so he visited the local people and learned that it was called the bright moon bird. Only then did Dongpo know that he had corrected Wang Anshi's poem "The bright moon branches call".

In the third year of Yuan Fu (11), Su Dongpo was pardoned and prepared to return to the north. Wang Anshi informed him to cross the sea from Hainan, go to Hepu and take a boat back to Nanliu River and go to Yongzhou. When Su Dongpo stayed in Lianzhou, he often saw a child holding a purple flower in his hand and shouting in his mouth: "Black dog, yellow dog, white dog!" Well ..... "When the child shouted at the flower, several bugs crawled out of the flower's heart. Su Dongpo was surprised and asked the child, what is this flower? What bug is crawling out of the flower? The child replied, "This is called a dog and a flower. What crawls out of the flower is a puppy, including a black dog, a yellow dog and a white dog. As long as you call it, it will come out." At this time, Dongpo suddenly realized. I have been demoted from Huangzhou to Danzhou, and the reason is that I have changed the poem of my teacher Wang Anshi by mistake. Wang Anshi asked him to go to these places to experience, increase his knowledge and make himself not too conceited. It is true that Su Dongpo was banished to Danzhou for political reasons, but legend is different from history, and legend is not equal to history, but it can give people some enlightenment, so it can be handed down.