Our 2 Westies we had used to watch fireworks from our front window and sometimes bark at certain ones in the street. Funny to watch them and nice they weren't afraid. The occasional thunder we'd get would just make them mad. They'd bark and have the attitude "knock that **** off".
Last year was the first 4th we had with our 2 rescue dogs and they seemed fine. They were aware but ok with it. Hopefully it will be the same this year.
But, if a UPS truck or FedEx truck comes down the street...... that gets them going!