Do you have to put sunscreen on his face? When I volunteered with a local humane society a few years ago, I had to put sunscreen on a couple of merle dogs with a lot of white on their faces. I think they were homozygous merles which I understand is a bit of a breeding no-no. They didn't have dark pigment on their eye rims and noses/muzzles and would get badly sunburned in their outdoor kennels.