Join Date: Jul 2012
Location: Hood River, Oregon
I have a pinto horse with a white nose and she has the same photosensitivity problems as your horse. I definitely recommend using a fly mask with a nose flap for sun protection. But be warned, a muzzle cover will mean a very dirty nose, especially in dusty pastures. Make sure to hose off the fly mask regularly and sponge your horse's nose with antibacterial soap as necessary. My horse got terrible dust blisters one year when I didn't clean her muzzle. If possible, remove the mask at night to prevent unnecessary blisters.
Another alternative is sunscreen. I recommend using at least 70 SPF because it will take a lot more than a drink in the creek or a rub against the fence to get that stuff to come off!