Our horses had experienced sunburn in their noses and we just put on sunscreen in order for it to heal. I'm just wondering if there are other parts in horses that gets sunburned?

In Arizona we have this problem with certain horses. Arizona has lots of sunshine and it would be unrealistic to apply sun screen lotion on a horse multiple times a day. You can actually buy sun sheets to cover the body of the horse. They also make special fly masks that have extra material to cover the nose. I have friends that have horses requiring this. Luckily, my horses are don't require this (knock on wood).

It is nice to have a horse blanket also when you have to ride. What we often do with our horses at noon is to tie them under a shade. And then after 4PM, my father would send me to untie them and let them roam inside their fence until evening around 6PM.