There are audio CDs that supposedly can desensitize a dog to thunder &etc. There is an instructional program that comes with them. I don't know if they are of any value, but suppose they can't hurt. This is a problem with a lot of dogs as they get older. With our last old girl who developed fear of thunder and fireworks, we would just put her in a box in the basement, pile blankets and comforters on it, put on some classical music, and pump her full of tranqs.
It didn't fix anything, but it got her through it.
It didn't fix anything, but it got her through it.