"We have a year and a half old yellow lab female. I read another review where the collar didn't work for the reviewer's lab, but in my case, what a difference. This dog of mine is my baby, but her incessant barking had turned into a nightmare. I'd let her out to do her business, barking. She would not stop until I literally had to go outside and corral her in with a treat. The neighbors, though being kind, I'm sure were getting very annoyed. And my husband and I were at our wits ends at night when with every single tiny noise outside, she'd bark for up to half an hour.
This collar has saved our sanity. I was getting to the point of just not 'liking' her anymore, though I still loved her. It's only been three days, and I hardly even put it on her anymore. She only needed one day of keeping it on and that was the end of the senseless barking. If she starts at the window, I jingle the collar (it has a buckle lock, not a snap, which is harder to get on her rather than a simple snap of a buckle), and she turns to look at it and stops. I honestly swear she is more relaxed and loveable. What an incredible change in our household! Please consider purchasing this collar, and even if it doesn't happen to work for you, Petco will take it back, no questions."