In the incident where Old Zhang killed the dog, the second principle, fault presumption, obviously did not apply. The third, the no-fault principle... likewise did not apply. This was because Old Zhang did not have the responsibility or obligation to ensure the safety of the other party's property. Furthermore, Cheng Chuxiao's actions were illegal, and there was a causal relationship between them and the damage. According to the Civil Code, if damage occurs due to illegal actions and a causal relationship exists, it does not constitute an infringement. The principle applicable to Old Zhang was precisely the first one: the fault liability principle. He was not at fault and thus did not need to provide compensation.
