Originally Posted by Macslady
I do beg to differ on the gender doesn't matter.
That is a rather blanket statement based on a single example. I regularly keep gelding and mares, mares and mares, and geldings and geldings together with no issues what so ever. That is based on 30 years of keeping horses.
I had a gelding a few years ago that absolutely could not be alone in the paddock. At the time I only had two horses and if I took the other horse for a ride, he would work himself up into a lather until I got back but if I took him for a ride, there was no
tendency to be herd or barn sour. He was an extreme, but as a general rule, horses always do better with a companion - and it doesn't have to be another horse.