What does it mean that the sage book goes into the dog's stomach by mistake?

The literal meaning of "the book of sages goes into the dog's stomach by mistake" means that all the books you have read have been learned in the dog's stomach.

Its actual meaning is mutual irony, and sage books can be translated into knowledge and education. The implication is to accuse the other party of being uneducated.

: The Book of Sages is a book written by sages. Ancient sages refer to books written by Confucius, Mencius, their disciples and descendants. It also refers to the "Four Books and Five Classics". The Four Books and Five Classics refer to the "Four Books" and "Five Classics" collectively, and are the core classics of Confucian scholars' research in past dynasties. Among the numerous literary works of China traditional culture, the Four Books and Five Classics occupy a very important position. The Four Books and Five Classics recorded in detail the political, military, diplomatic, cultural and other historical materials in China's early ideological and cultural development history, as well as the important thoughts of thinkers such as Confucius and Mencius. The four books refer to the university, the golden mean, the Analects of Confucius and Mencius. The Five Classics refer to The Book of Songs, Shangshu, Book of Rites, Zhouyi and Chunqiu. Spring and Autumn Annals are usually published together with Zuo Zhuan, Gong Yang Zhuan and Gu Liang Zhuan, which explain Spring and Autumn Annals, because their words are too brief. The naming of the Four Books began in the Song Dynasty, and the naming of the Five Classics began in Emperor Wu of the Han Dynasty. The word "sage's book" comes from Wen Tianxiang's boast.