His girlfriend left him, he had to find something to vent his anger, then the dog is the best choice. The girlfriend makes him suffer, and the dog belongs to his girlfriend, hurts the dog make Duanying Chen happy. His ego totally takes over the super ego. Freud pointed out, "There is nothing of which we are more certain than the feeling of our self, of own ego"(12). People will try to get rid of something negative, that is their instinct. He dares not to bring huge injury to his girlfriend, and his super-ego tells him if he does that the law will sentence him serious. In addition, he fear of lost of love from his girlfriend, once he beat up his girlfriend may leave him forever, then he have to feel alone again in the U.S. Also if he did that,
