My dog is nearly 2 and is quite a sensitive chap to noises, like fireworks and thunder.
The vet gave us one of these to use when we next go as, like most dogs, he hates the vets
I used it when we had quite a bad thunderstorm, wiping over his neck and muzzle and within30 seconds he was lying down having a snooze
Not sure what’s in it to react as quick, but he was far more rested and when we had another storm the following night he ignored the thunder noises and was quite chilled.