My girls are about 3 1/2 months old. We let them free range for awhile each day, but when they are in their pen, even though they have fresh water, they seem to be panting. I don't want them to be overheated. We have a board that covers the sunny side of their pen. I know they don't like to get wet, but what about hosing some water in their pen for them to burrow down in?