Any ideas to help a old fluffy dog keep cool? It is really hot at the moment, she has one of those cooling mats. She does not really like water
Shade, plenty of cool water, maybe ice cubes to lick.
Have you made sure to brush out as much fur as possible? I know that shed fur can sometimes get tangled instead of falling all the way out, but of course the dog is cooler with it gone.
You say she's got a cooling mat. Is there also a stone or tile floor available? Sometimes those are nice and cool to lie on too.
Air conditioning could certainly help, if it's available. Otherwise, put a fan somewhere-- I've seen a panting dog put its face in moving air, probably because that makes the moisture evaporate faster so it cools the dog a bit more.
(You've probably thought of most of these already. I'm just listing everything I can think of in hopes that something will help.)