Why breathing sets the whole plan
A French Bulldog's short airways make heavy panting inefficient, and fireworks fear drives exactly that: rapid, anxious panting in a dog who cannot move air or shed heat well. So the fireworks plan for this breed is a cooling plan wearing a calming plan's clothes. Choose the coolest room in the house, ideally an interior one with curtains to block flashes, run a fan if the evening is warm, and put his bed on a cool floor surface rather than a deep, heat-holding cushion. Offer water little and often. Snug calming wraps suit many breeds, but on a hot French Bulldog anything that adds insulation deserves a second thought, and his comfort and breathing rate are your guide.
Settle him before the noise starts
Finish walks and garden trips well before dark, because twilight is when stray early fireworks catch owners out, and a French Bulldog who panics mid-walk can damage his breathing with even a short, frantic pull home. Feed him a little earlier, let him toilet, then bring him into his room with a chew or a licking mat to work on as the first bangs sound. Background sound from a television helps cover distant pops. Stay with him for the first stretch if you can; this is a companion breed that reads its person's location as safety information, and being shut away alone often escalates the panting you are trying to prevent.
Reading stress in a flat-faced dog
Learn his escalation signs so you can act while he is still coping: faster panting with the mouth pulled wide, restlessness between bed and door, drooling, wide eyes and a reluctance to settle even against you. Slow things down by dimming lights, reducing household traffic through his room and speaking quietly. If his tongue looks very dark or bluish, his breathing sounds harsh and laboured, he gags or retches repeatedly, or he seems wobbly or unusually drowsy, treat that as urgent and contact an emergency veterinarian, because those signs point to a dog whose airways and temperature are no longer coping. Do not walk him to cool him down; keep him still, cool and calm while you get advice.
Doors, guests and the overheating bolt
Fireworks nights often coincide with parties, and an open front door plus a startled French Bulldog is a bad pairing, because his escape will not take him far but the sprint itself can overheat him. Keep him in his room during arrivals, with a clear household rule that his door stays shut, and put a note on it if guests are unfamiliar with the routine. Check his collar fits properly, neither tight on his neck nor loose enough to slip if he backs away from a bang. Once the display ends, wait until the street is properly quiet before a short, calm garden trip on a lead.
Because a loose French Bulldog tires and overheats quickly, minutes matter if he gets out, and KinsLe's Lost Pet Alert System helps by alerting nearby members at once and letting a finder message you directly through his profile.