Why are ancient military advisers called "dog-headed military advisers"?

Wu Yong, an ideologist, is a good Mr. Jia Liang. Smart life, read thousands of books. Make two copper chains. Wu Yong gave advice to Classical, outwitted the birth outline, charmed Yang Zhi, a green-faced beast, and stole hundreds of gold, silver and jewels that Liang Zhongshu, the official of Beijing, gave Taishicai for his birthday. Song Jiang was caught reading anti-poetry in Xunyang Building, and was taken to the execution ground with Dai Zhong. When he was about to cut, Wu used a trick to rob the giving ceremony and save Song Jiang and Dai Zhong. Sung river hit Zhujiazhuang twice and failed; When attacking Zhujiazhuang for the third time, Wu conquered Zhujiazhuang with the strategy of interlocking his palms. When Wu Yong broke the serial horse, he sent a thief to trick Xu Ning into Liangshan. When Song Jiang was in trouble in Huazhou, Wu Yong gave advice and borrowed Su Taiwei's golden bell to hang it, and rescued Jiu Wenlong Shi Jin and Hua Monk Lu. During his life, he made many ingenious plans and made many meritorious deeds. Zhao An was appointed as Wu Shengjun's special envoy. After Song Jiang and Li Kui jy were killed, Wu Yong hanged himself in front of Song Jiang's grave with Hua Rongdao and was buried with Song Jiang. A model of a thousand-year-old dog-headed militarist: martial arts, wisdom and many stars, yelling at Hedong lions with ink knives, and having a virtuous mother at home. A model of a thousand-year-old dog-headed strategist: Wu Yongfu, a wise man, is a "dog-headed strategist", which generally refers to people who are sharp and narrow-minded and good at giving bad ideas. It is not uncommon for such people to accomplish nothing, but nothing at all, in the history of China. Representative figures such as Jiang Gan, Cao Cao's counselor, mistakenly listened to people's words, which led Cao Cao to behead his water army general Cai Yun and self-destruct the Great Wall, thus losing his strength in the Battle of Chibi. Many people like to compare Wu Yong, a multi-star in Water Margin, with Zhuge Liang in Wolong in Three Kingdoms, and think that their origins and experiences have too many similarities: they were born in troubled times, born in talents, assisted the wise masters, worked hard and died in the world. Moreover, many illustrations and pictures in later generations painted their looks like clones, including raccoon instant noodles popular among primary school students that year, and a list of heroes of the Water Margin attached. It is estimated that Wu Yong's modeling is even candidly admit defeat to Zhuge Liang himself, and it should be a "super imitation show". Many people have a good impression on the role of Wu Yong, thinking that he is witty, sensitive and loyal. He was born for the well-being of Liangshan brothers and died for his neighbors. He was a loyal man and a model of literati through the ages! However, I always thought he was just a crappy dog head strategist, that's all! Before making a fortune, Wu Yong worked as a little-known rural private school teacher in Dongxi Village, Yuncheng County. He and Chao Gai, the village chief, are friends who grew up playing with mud. In the novel, I borrowed Wu Yong and thought to myself, "Classical I have been friends since I was a child, but there are some things I will discuss with me. I know all his relatives know each other. " It can be seen that the relationship between Chao and Wu is quite hardcore. Liu Tang told classical a good news, Liang Zhongshu's gold and silver jewelry is about to transit. The first thing that Chao Gai thought of was his good friend Wu Yong. At that time, Wu Yong had expressed strong dissatisfaction with the meager salary of primary school teachers. How could he miss such a good opportunity to make a fortune? Classical is still in a daze for manpower problems. With a change of mind, Wu thought of three alternate members, namely, Ruan Jinyong, the three great heroes. And the development of things is the same as Wu Yong expected. For the Ruan brothers who are about to be laid off, this huge wealth from improper sources is extremely attractive.