The Pet Corrector Stops: Barking, Chasing, Stealing, Jumping Up and Place Avoidance. It works by emitting a hiss of compressed gas to interrupt a dog’s unwanted behaviour. This distracts the dog and allows the dog owner or trainer to insert a positive command such as "sit" or "down" and reward accordingly. It is used and recommended by trainers and behaviourists throughout the world. Available in 50 ml.