Start with a safe toilet plan, not a full walk. A frightening bang outdoors can make even a familiar doorway feel unsafe afterward. Pulling your dog through it or waiting outside until they give in may add another bad experience. If fireworks are still going, keep your dog safely indoors. Secure doors, windows and identification in case they bolt when you next go out.
When it is quiet, offer a brief trip to the nearest familiar toilet spot with a secure lead. Let them turn back if they cannot cope. If your dog strains without producing urine, seek emergency veterinary care. Ask your vet promptly if they cannot pass stool, show pain, or remain too frightened to meet basic needs. A temporary indoor toilet option may be useful, but plan it with your vet for the dog's health and circumstances. Do not punish an accident indoors.
On another calm day, practise easy movement toward the exit without pushing past fear. A qualified reward-based professional can help if the avoidance continues. The noise-fear guide may help plan future events, but it does not replace urgent help for a dog who cannot eliminate.
Today, check whether the noise has stopped and set up the shortest safe toilet opportunity. Comfort and bodily needs come before the usual route.
Sources: Dogs Trust on fireworks safety and recovery, VCA on severe noise phobias, Dogs Trust on toilet accidents without punishment, VCA on urinary emergencies.