I would look at the horses and observe them for a moment or so to see their actions etc etc... most likely if they are running free aka free range then you should not have much to worry about, as long as the owner tends to them on a regular basis and not just let them run wild like a Mustang. Like my neighbor next door he has a 700 acre farm that he allows 40 head of horses and roughly 100 cattle, he never rode any of the horses nor have they had a saddle on their back since the 80's, they only knew him and once they saw you they would look at you for a moment or two and then take off running. Ok now that all that's out of the way... I have a mare, a cult, and a stud, all three running together. They come and go as they please. I have a 20x30 Barn open barn no stalls has a manger in the middle but all three horses eat from at the same time. Plus all three of the horses are as calm as little lambs.
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