i actually had that same one for my very very active 4 month old golden retriever. i put it on her when we were travelling the 3 hour car ride to the airport. shes was quiet in her crate on the way there, which she never is. so it did work,but not as long as they claim it does. i put it on her after she got off the plane, and she was just as nutso as ever, which of course could be due to the fact she was just in a crate for a 8 hour flight...but even after she had time to settle in, i didnt see any difference with the collar on. each dog might react differently to it though, i know the price i paid (bought it through my vet) i wouldnt buy it again.