We are starting to think that my mare has this or is esntialy a non sweater. I rode her this morning and it is like 82 degrees out and 70% humidity and I was sweating, but she had no sweat on her when all was said and done, neither did her colt but he was still cool to the thouch, but she was hot! So I rensed her off. But this has all been going on for a while, and she normal sweats, but this year she's tyed up, gotten hives tooo many times. And she has now developed a rash, also yesterday when every horse in the field she was in was very sweaty she was dry. Is there any thing I can do for this? she's on electrolites and hhas free choice salt and mineral blocks and has 3 buckets of water.