I haven't seen too many people that set off fireworks around their horses but my neighbors go nuts with it, July 4th and New Years. I'm really hesitant to call the cops on them but I'm gonna wish I had of if one of my horses runs through the fence or they cause a fire.
I'm on a hill and I'm above them so they can clearly see me standing in my barn. Last 4th of July they were setting off tons of firecrackers and I stood in my barn door with my hands on my hips and stared at them. To their credit, they took the hint and quit. Their horses were going berserko and I wonder if the owners of those horses know what the barn owners are doing.
I'd want to know if I were boarding there. They are supposed to be the caretakers.
I've asked my neighbors what their plans were so I could prepare, they always say they won't be doing much, and it always ends up being more than my definition of 'not doing much'! :~D
The first year when I didn't have a barn, I stood out in the paddock with mine, and figured out if I held the pony and she wasn't running, Bay didn't run so much either. For the fourth now, I put them inside and give them quitex. They are really not as bad as the dog. The ones that bother the horses are the whistely ones and the ones that crackle like fire, more than the booms. They ALL bother the dog, even sounds a couple miles away.
I'm amazed that these people were shooting off fireworks with horses on their property.