I was very sceptical when I bought this. Our 6 month old puppy had a second operation after being spayed due to the inner stitches failing due to an allergic reaction. We had to keep her calm and in a cage for 10 days, which she wasn’t used to, and it was becoming increasingly difficult as she has so much energy and was becoming distressed being in the cage. Within minutes of plugging this in she was nice and calm. It has continued to work over the past 5 days and it has absolutely saved my sanity, and probably saved the dog doing herself more harm. Although it may not have the same effect of every dog, I would definitely say give it a go!