Just an update on the progress of our dog… Having used the Pac Collar for two weeks his behaviour has been transformed. Formerly we were unable to let him off the lead because he would come back only when it suited him to do so; now we are able to give him the exercise he needs in areas where there are plenty of other dogs, cyclists etc, confident that he will come back when called. We only rarely put the collar on him now unless we know it’s going to be very busy or there’s a chance of meeting livestock. Thank you for an excellent product.