Am I the only person who takes a spray bottle of water to keep the dog cool? Used on the neck and throat, under the belly, under the ears (if drop ears) and inside the backlegs it's
very effective ;) It's also useful for getting moisture into the dog if they're like mine and won't drink when travelling :)
I have taken one of my bitches in the ring on a blistering day in August, soaking wet

By the time the judge got to her she was dry and cool, other bitches were looking hot and bothered by then. She took her last CC and BOB that day and was still fresh when she went in the group ring :-D
I do tend to make use of
any shade available, even in the ring it's possible to shade the dog with your body most of the time ;)