Metaphor is the one kind of rhetoric of language expressions. When people describe the Intangible and abstract things and moods and ideas in detail, they often use the metaphor to express it vividly. Animals are living together with us human people on earth. Among this, the most outstanding relationship is between dogs and human beings. When people know the dogs at the same time, they also affected by the dogs. But the effect is not to have all the same result to different people, it has different results to different people. This is because the human geography environment, life habit and experience are different, the cognition of the same things will be different. This article is trying to discuss the idioms of dogs between the Chinese and Japanese combined with human cognitive. Specifically to discuss not only the form, the meaning but also to discuss the similarities and differences existing in behind around the idioms related to dogs. And to discuss the differences of cognitive between the Chinese and the Japanese .