I was at my wits end with my dogs. They bark outside at everything, so I thought I would give your product a "try". I put the collars on them, and out they went to the usual "barking spots". Within the first attempted bark, they were both stopped immediately. I was pleasantly surprised. I took them to the 4th of July celebration at a friend's house with the collars on, and they were again stopped. It made our get together very enjoyable, and peace of mind. I would definitely recommend ...