
Hi Danny,
unfortunately everyone is in the same boat at any show in hot weather :( All you can do is either decide not to go or ensure that you have suitable items with you to keep your dog cool and comfortable during the entire show day such as a chilled mat to lie on in the cage/bench, set out with frozen bottles of water that will thaw gradually through the day, take an ice box/bag to refresh water and towels etc and a silvered sheet to deflect the sun.
You can ask the steward to seek the judge's permission for you to move to an area of the ring when judged which will provide shade / shelter for your dog - we usually have a seat ringside with a parasol set up for shade.
There are ways around things although TBH I'm intentionally missing the July shows this year because last year we felt that travelling so far with the dogs in extreme temperatures was just too risky had there been a serious traffic jam etc. You know best how your dog and self will cope.
best wishes, Teri :)