My daughter is so pleased with it. We are babysitting Cole for her this week and we can tell a Huge difference. He doesn't bark as often & if we speak to him to quiet down, he listens now. He also use to bark at the television when certain things came on, especially animals, animation etc. He does Not do that now. awwwwwwww, what a relief! We didn't even bring the bark repeller to our house while babysitting so he has shown a HUGE improvement!