I bought 2 gentle spray pet collars and I believe that they probably,in general work well. The problem I had is one of them didn't work properly as soon as I got it and I didn't take the time to return it. Now it's been about a month and the other one does not work either. The problem with the first one is it sprays constantly. Even if my dog makes a slight sound it goes off. The other one now won't go off at all. I have filled it and it seems the valve is not working. So one of the dogs is still barking because it won't discharge and my other dog can't wear it because every little thing makes it go off. My friend that told me about them only has one dog and hers works great. I should take the time and return them but my schedule is hectic and it's hard to find time to address it.