There is no fastest way to rule out rabies, but the specific method can be determined by the ten-day observation method. In the Third Report of the Expert Consultation on Rabies published by the WHO, the ten-day observation method was proposed, which can be used to rule out whether an animal has been infected with rabies after it has been injured. If the injured animal, such as a cat or a dog, is infected with rabies virus, due to the proliferation of rabies virus in the brain, as the virus continues to multiply in the brain, it will lead to the onset of disease or even death of the sick cat or the sick dog after a few days. In addition, the animal will also experience abnormalities such as anorexia, restlessness, fever, difficulty in swallowing as well as being easily frightened, and may even develop aggressive behavior until it eventually dies. In addition, this method is not absolute, therefore, it is recommended that after rabies exposure, it is still necessary to get a full rabies vaccination to ensure safety. For specific cases, it should be used as prescribed by the doctor after consulting with him.