Several variables affect how quickly your dog’s behavior will change, most notably the personality of your dog and the environment in which you are training the dog. Most dogs begin to understand the relationship between pulling and the vibration/stimulation after several activations of the collar. The pulling behavior diminishes quickly in some dogs and more gradually in others. If there is no noticeable change in pulling behavior after a reasonable trial period, check the collar to make sure the fit is good and the contact posts are the correct size. If collar fit is appropriate and the dog continues to pull, the SideWalker® setting should be increased one level.