These work great on my little dog, he is sensitive to noises and instantly stop barking when we use this. After several days of using he now calmy sits at the window watching people and dogs walk past. No more barking uncontrollably at people outside.

It worked first try for our dog, he immediately stopped barking. My dog is very sensitive to noise though so this works well for him.

Works great but as described it doesn't work for all dogs, it doesn't work for young and old dogs over 8 years old.