I read all the reviews about this and was excited to try it. I have two stubborn Cocker Spaniels who love to hear themselves speak. This has high ratings but did not work on my girls. They did not seem to mind the ultrasonic sounds and totally ignored it. A fiend brought her black lab over to visit and it totally freaked him out. He was aware of it and wanted it to stop immediately. I sent it back but I think it is worth a try if you are sick of the noise.