Abstract: A pet leash tension shock apparatus for training pets not to pull on a leash includes a collar and a buckle coupled to the collar. A pair of electrodes is coupled a collar inside. An electric connector is coupled to the pair of electrodes. A leash is coupled to a leash connector coupled to the collar. A tensiometer is coupled within the leash to measure tensile force within the leash. A feeder wire is coupled within the leash and is in operational communication with the tensiometer. A controller is coupled to the leash. The controller is in operational communication with the feeder wire and has a battery to deliver an electric shock to a pet through the pair of electrodes when the tensiometer senses tensile force within the leash above a preset threshold.