I don't know what the "official" answer would be but we live in Central Florida, the home of Sunshine, and haven't noticed any sunburns on our babies. They like to lie in the sun until it gets too hot. Then they come inside to cool off, get a drink, then go outside again!!!
Yes, Big Rick has some beauties there! Thanks for setting me straight on the sunburn--I was always under the impression that their short coat failed to protect them (but not worried enough to put sunscreen on her, it's hard enough for me to get it on myself).