Complaints from the neighbours about our dog barking prompted research into bark collars. We had used one with some success on a previous dog and thought it would do the trick with our 9 month old German Shepherd. The Dog Line site was easy to navigate and delivery was prompt. Unfortunately our stubborn ( not so)little miss thinks its a joke. She yelps at a shock but continues to bark. It is hard to know if the intensity is increasing and she does not appear to associate the sting with the barking. Disappointed with the purchase. I hope other customers have better outcomes