If you are searching for a behavior modification tool for your canine, then you may want to try a shock collar. Shock collars are made by many different manufacturers and therefore can be very different. The earliest collars only had one level of stimulation to deter the dog from the undesired behavior. Currently made collars are more advanced and offer a range of stimulation levels. The range can go from a slight tingling or tickling feeling to an extreme feeling of discomfort for the dog. What level should be used depends on the sensitivity of the dog. The lowest possible stimulation that the dog will respond to is definitely the best.