I have a 2.5 year old German Shepard who is the best dog; until you put a fence or gate between her and another dog. We live on a busy street, people walk their dogs past our gate all the time and she just goes nuts. She's such a loveable dog but people are petrified of her, and our neighbours started to complain about the barking. We tried everything, we were recommended this collar for recall, so we thought we'd give it a go. It has been BRILLIANT. Barking has minimised, not as vicious sounding and when we call her from barking she pretty much comes straight inside. I made my partner test it on himself prior to our pup as I wanted to know it wasn't going to be cruel. If you follow the instructions and use as recommended you will find the collar only needs to be worn to be effective. Glad I made the purchase!! Casey