Several years ago a horse in our community stalls spooked while its head was between the railings to another stall. These stalls have very typical openings between the railings. Long story short, the horse broke its neck and died.
Horses are very susceptble to spooking--it is a part of their nature. Some breeds are more susceptible than others, and training and familiarity can reduce but not eliminate the risk of spooking. So yes, Maxx, your chickens are a very real danger to the horses when they fly over or get through your fence into the neighboring property. It really is pretty much the same (in reverse) as if they had a dog that was getting into your yard and posing a risk to your birds.
You need to make sure that the fencing is close enough to the ground that the chickens do not get under it, has small enough openings (if any) that the chickens cannot get through it, and tall enough that they cannot get over it. If there are bushes or other objects that the chickens can use as a ladder next to the fence, they likely will. I have 8' block walls, and for the most part my birds have never flown over. However, I HAVE had a few who will go over if there are intermediate "steps" to get over the fence. When I had guineas, they DID fly over the fence. One of my muscovies is nearing the point where she can fly over it.
Consider clipping wings (if you are not showing them), or as others have suggested, use a tractor when letting them range in the yard. Make sure the neighbors know that you are trying to contain them.
Horses are very susceptble to spooking--it is a part of their nature. Some breeds are more susceptible than others, and training and familiarity can reduce but not eliminate the risk of spooking. So yes, Maxx, your chickens are a very real danger to the horses when they fly over or get through your fence into the neighboring property. It really is pretty much the same (in reverse) as if they had a dog that was getting into your yard and posing a risk to your birds.
You need to make sure that the fencing is close enough to the ground that the chickens do not get under it, has small enough openings (if any) that the chickens cannot get through it, and tall enough that they cannot get over it. If there are bushes or other objects that the chickens can use as a ladder next to the fence, they likely will. I have 8' block walls, and for the most part my birds have never flown over. However, I HAVE had a few who will go over if there are intermediate "steps" to get over the fence. When I had guineas, they DID fly over the fence. One of my muscovies is nearing the point where she can fly over it.
Consider clipping wings (if you are not showing them), or as others have suggested, use a tractor when letting them range in the yard. Make sure the neighbors know that you are trying to contain them.