A pet training tool includes a pet collar configured to be placed around a neck of a pet, a balloon assembly used for stimulating the neck of the pet during training of the pet, and a movable neck plate. Two ends of the neck plate are movably connected to a lower part of the collar. The balloon assembly, the collar, and the neck plate are disposed together. The balloon assembly controls relative movement of the collar and the neck plate through inflation or deflation to tighten or loosen the collar.