I think the predators around here have the same fear as your horse. We see very few of any of them around anymore.Oh my goodness, I hate you you lucky donkey you! If I brought a donkey home, even a mini, my horse would hit the roof. I used to live in NY and I took her to Syracuse for the State Fair several years in a row. This one year the donkey and mule show was going on at the same time as the 4-H show and apparently my horse has a serious phobia of anything donkey-like. She is an Arabian and she is super-smart. She's not really afraid of anything, but has always used fear as an excuse for getting out of things she doesn't want to do, so I can just generally blow her off when she spooks and make her do whatever it is that I want her to do.
Not the donkeys though, when I say phobia, I mean Phobia. I've never seen her that afraid of something. She really was convinced that those donkeys were the minions of the devil sent to Earth to eat her. She doesn't even object to guinea hens as much as she does donkeys.

Normally our donkey runs anytime the cows come up. They are always chasing her away from any good food if we don't intervene. But tonight when we brought the jack home, she actually pushed the cows out of the way to get the best look at him!