My Poppy has always had a problem with loud bangs and even motorbikes can freak her out. Firework season is a particular problem for her. My vet's recently recommended a natural plant extract (It's made by Canibio but I got it from www.chemeyes.co.uk, I expect it's available on Amazon etc but I haven't looked). I've been using it for just over a week and already there's a noticeable difference, instead of jumping on the sofa in a panic when she hears something she just looks at the window which is really great progress for her. I'm hoping firework night will be stress-free this year but I'll update again and let you know if was effective for repetitive bangs! If you have a nervous dog I can definitely recommend it.