Got a buddy with an 8 month old Chessie pup,he wasnt having any problems with loud noises til july 4th when one of his neighbors set of a string of firecrackers when the pup was outside by the fence.He is coming out of it but it will be a slow process.The guy is a real a$$ that did it I would have most likely ended up as a visitor of the city while he ended up visiting a hospital after that as he had though it was funny in doing what he did and had waited for my friend to let him out just for that purpose,needless to say there is some bad blood there now.
But yes you can get the dog over it but it takes time and a lot of paitence.