Pets are afraid of fireworks, so below are some safety tips and precautions you can take. (Unfortunately if you live in a neighborhood with people who are inconsiderate, try to generate white noise and even give your pet a Benadryl to make them sleepy (1 tab over 30 lbs, 1/2 tab under 30 lbs).
Some Veterans who suffer from PTSD (post-traumatic stress disorder) are also afraid of fireworks, as the loud noises can trigger the PTSD. I heard from one veteran who said fireworks don't both him, but for others fireworks act as a trigger for PTSD, so this isn't meant to be inclusive, however, if you have a veteran living in your neighborhood and you don't know their situation or reactions, take the cautious approach and assume that fireworks do affect their PTSD.
Bottom Line: If you live in a neighborhood with a veteran, or where there are pets, please, please be considerate and do not light off loud fireworks.