I don’t think it’s “love” like we love our friends, family, etc. I akin it kind of to the way a horse might “buddy up” with another. They recognize and prefer the company of some people, horses, creatures. I think it is more interesting how some horses are very clearly one-person horses, while others will be tolerant and nonplussed by pretty much anyone.
My current two…well, the mare loves everyone :lol: My gelding is a bit of a character now, but he was kind of “vacant,” for lack of a better word, when I first got him. I attribute this to having changed hands a good bit as a racehorse. He doesn’t act like a horse that was ever mistreated and he doesn’t appear any more or less nervous around anyone in particular, but I can’t explain it any other way but to say he visibly “softened” after owning him a month or so. Like “oh, I guess you are sticking around.”
I owned a super pony probably 15 years ago who was 100% a one-person horse, most particularly under saddle. It’s not like I was some phenomenal rider, but once he “knew” his rider he was a completely different horse than if some stranger just hopped up on him. He was the sweetest little guy, but so very sensitive.