中兽医学的理论体系,是以阴阳五行等朴素的唯物辩证思想为基础的。首先它认为动物的生命变化是按照阴阳的对立原则进行的,而动物体本身就是个阴阳对立的统一体。动物体的内与外,背与腹,脏与腑等等都是阴阳对立的。尽管它们是对立的两个不同方面,但统一起来却能发挥相反相成的作用。对立统一保持协调时,能维系动物体的健康,对立统一受到破坏时,动物体就会发生病变。阴和阳是对立的,两者之间,又经常互相关联, The theoretical system of veterinary medicine is based on the naive materialist dialectical thoughts such as the yin and yang elements. First of all, it considers that the life changes of animals are carried out according to the principle of opposition between yin and yang, while the animal itself is a unity of yin and yang. Inside and outside the animal body, back and belly, dirty and organs, etc. are yin and yang. Although they are two different aspects of opposites, they can all play the opposite role. Opposition unity to maintain coordination, can maintain the health of animal body, unity of opposites damaged, the animal body will occur lesions. Yin and Yang are the opposite, between the two, and often associated with each other,