Domesticated pets are instinctually sensitive to hissing, used by snakes, insects and birds such as geese to drive off predators. Mimicking this sound, the Pet Corrector emits a harmless and unscented hiss of air which interrupting undesirable behaviours in dogs. It helps correct excessive and inappropriate barking, jumping up and stealing, as well as sneaking into forbidden places. Included in this package is a detailed training guide. This method should only interrupt serious misdemeanours, and alternative desirable behaviours should be rewarded. Responsible use is important: this is not a substitute for poor training. Three sizes are available.