A guardian who cannot identify the threat
Fireworks frustrate a German Shepherd in a particular way: the noise signals danger to a dog bred to assess and respond, yet there is nothing visible to assess, guard or drive off. That unresolved alertness is why Shepherds pace between windows, bark at each bang and position themselves between their family and the door. Help him stand down by making the evening deliberately ordinary and structured. Work him in the afternoon with obedience, tracking games and a proper walk so he starts the night physically spent, then run his normal feeding and settling routine as if nothing unusual were happening outside.
The room and its barriers must match the dog
Choose a room with a door that truly latches and windows that close securely, and clear it of anything a large, restless dog could knock over while circling. Some Shepherds settle best with a defined place, so put his mat or bed in the corner he chooses and reward him for using it, without forcing him to stay when he needs to move and resettle. Keep curtains drawn against flashes. If he scratches at the door or tests a window, stay calm and redirect him to his mat or a chew rather than scolding, because punishment layered onto fear teaches a Shepherd that fireworks nights also mean an angry owner, which raises his guard instead of lowering it.
People, children and the protection instinct
Keep the household small and predictable for the night if you can. Guests who shriek at bangs, children running between rooms, or someone repeatedly opening the front door all feed a Shepherd's sense that the home is under threat. Let him be near you, since proximity to his person is this breed's main reassurance, but give him an exit from attention: he should be able to move away from petting and lie apart without being followed. Warn visitors not to loom over or grab at a stressed Shepherd, however friendly he is on normal days, because a startled guardian can snap when cornered by hands during a bang.
Signs that mean more than nerves
Expect some panting, pacing, ear-flicking and barking; those usually settle once the sky goes quiet. Contact a veterinarian promptly if he injures himself forcing a barrier, if he drools and retches with a swollen-looking abdomen, if he pants without easing long after the noise ends, or if an older Shepherd seems disoriented, weak in the back legs or unable to settle at all through the night. Note which room, which background sound and how much evening work preceded his calmest spells, because Shepherds are creatures of trained routine and next year's plan can be built directly from this year's notes.
A frightened Shepherd running loose can worry the public and may avoid strangers trying to help, so KinsLe's Lost Pet Alert System matters because it alerts nearby members who can look out for him and lets a finder reach you directly through his profile.