A few years ago, on July 4th one of my mom's dogs freaked out, somehow managed to escape, and got hit by a car before my mom found her. She loved that dog, regularly attending nose work competitions with it.
One of your pets getting a seizure must be harrowing for both you and the dog.
My female Weimaraner was terrified of thunderstorms and fireworks. Once, she managed to squeeze herself under my Mini Cooper. I didn't know at the time that panic vests were a thing. The breed is a gun dog ¯\_(ツ)_/¯. I forget how we managed to get her out from under there, but it took a bit. My Akita doesn't care, he checks the balcony, yawns, and back to his toys. But he is a afraid of air balloons and blow up Christmas Santas. Go figure.
I don't light fireworks.