Your Brittany may be descended from generations of hunting dogs used to the sound of rifles and shotguns, but that doesn't mean your Brittany enjoys loud noises. Hunting dogs are trained to anticipate the crack of a gunshot, when it thunders or fireworks pop it is unexpected and can scare your Brittany.
People can have fear triggers such as spiders, snakes, heights, flying, public speaking, or mice. For dogs, common fear triggers are thunderstorms, fireworks, being left alone, and a change in routine.
Apply Relax Dog Aromatherapy to your Brittany prior to or at the start of, the stressful event (as in, apply right as the storm starts). While your dog will probably never enjoy a fireworks display, with Relax Dog Aromatherapy they can make it through a stressful situation with less pressure and stress.