Fireworks scare animals, and cause stampedes and accidents. They can also cause pregnant animals to abort. The best idea is not to have fireworks near the open Forest where there are animals about. If you must have fireworks then let the local farmers and horse-owners know. Give them plenty of time to get their animals in. Ponies and other animals can be very stressed by sudden loud noises, so think twice before buying fireworks if you live in or near the Forest.