No-Pull Trainer The No-Pull Trainer is a lightweight device that was designed to stop all dogs from pulling. The No-Pull Trainer will stop any dog, any size from ever pulling again. This product is guaranteed to work The No-Pull Trainer is available in three sizes and simple to put on dogs. No collar is required. The No-Pull Trainer is a lightweight device that was designed to stop all dogs from pulling. The No-Pull Trainer will stop any dog, any size from ever pulling again. This product is guaranteed to work! The No- Pull Trainer is available in three sizes and simple to put on dogs. No collar is required.