A Doberman does not experience fireworks as background noise. This is a breed selected to watch, notice and stay close to one person, so repeated bangs can turn that attentiveness into pacing, leaning hard against your legs, whining and trying to position himself between you and every door. Your plan for the night should be built around his size, his strength and that Velcro-dog attachment.
Tire the body and give the brain a job first
Earlier in the day, well before any displays start, give him a proper outlet: a long walk, some controlled running in a secure area, and a short, familiar training session of positions and recalls he already knows well. A Doberman who has worked both muscles and mind settles more readily than one who has only been walked around the block. Feed him a little earlier than usual too, so his last toilet break on a lead can happen before dusk rather than in the middle of the noise.
Secure a room for a dog who could force a door
Pick one interior room and make it the base for the evening. Check what a powerful, aroused Doberman could actually defeat: a flimsy baby gate, a door with a lever handle he can paw down, a window left on a latch, or a garden gate he has already learned to lift. Close curtains against flashes, keep his bed near where you will sit, and remove anything valuable from tail and shoulder height if he starts circling the room. His collar should be on and fitted so it cannot slip if you need to hold him calmly.
Stay close, stay dull, and do not restrain him
Most Dobermans want contact, so let him lean, lie across your feet or rest his head on you if he seeks it. Keep your own behaviour deliberately unremarkable: no rushing to windows, no raised voices when a big bang lands, no repeated anxious stroking that tells him there is something to worry about. If he alerts and barks at volleys, acknowledge him quietly and redirect him to a long-lasting chew or a stuffed toy he can work on lying down. Avoid pinning or hugging a panicked large dog tightly; if he needs to move, let him pace a short route and settle again in his own time.
Know the signs that this is more than one bad night
A Doberman who drools heavily, pants with his mouth wide for long stretches, tries repeatedly to break out, or injures himself against a door needs more than home management, and a call to your veterinarian for guidance is sensible even during the evening. If the same extreme reaction returns at every display, raise it at his next appointment too, because a pattern of panic is worth a proper conversation rather than being endured year after year.
If he does force his way out, a dog of his size can cover serious ground quickly, so getting word out fast counts — KinsLe's Lost Pet Alert System sends a free alert to nearby Circle of Love members, and anyone who finds him can message you directly instead of guessing who he belongs to.