I don't know of any.. but I'm game! My poor dog is cowering at my feet as we speak, he has squeezed his 90+lbs into the small space beneath my PC because again tonight people are setting off fireworks. Again I have yelled out my window for them to stop.. thankfully it worked again!
However I would be interested in having something to put on his ears so he can't hear it. But I'm not sure most dogs would accept such a device. I'm picturing those headphone-like ear things with the dial on the side you can use to adjust how much sound you hear. Maybe just some kind of "headband", like thing would be better for a dog.. something you could easily slip on and off, to block out the sounds. Good luck with your invention.. if ever I see it I'd buy it.. my dog hates storms and fireworks.
Bah!! They started fireworks again! I just called the police I'm fed up with this crap.. it's 1030PM people should have some courtesy for their neighbours and their dogs....