Hey, so in 1.8 - 1.8.9 horses don't work (don't know if it's a known issue or if it has to do with ViaRewind but i really think it does) You can tame a horse, you can put a saddle on it but the saddle won't show(same for horse armor) and you can't ride the horse, you can just stay on him. In 1.9 and above it works.

I'm blind forget it