The Pet Corrector emits a stong hiss which mimics a natural defensive sound of many animals. Dogs have an instinctive sensitivity to this sound. The Pet Corrector has been successful in interrupting undesirable behaviors such as barking, jumping up or stealing food in most dogs. A detailed training guide containing training tips and key dos and don'ts is included. It is important that the Pet Corrector is used responsibly. The 50ml Pet Corrector can be slipped into a pocket or be carried in the specifically designed "optional" Pet Corrector Holster.