In the summer I put a huge tarp over the dog run so he gets shade all day and his water bowl is always full. On the really hot days I'll add ice to his water bowl. He chills out or sleeps in one spot during the day and just paces himself so he doesn't heat up, same behaviour as wolves in the summer. He definately enjoys his baths in the summer too. I just tie him up to the garage door and hose him down after lathering him up with baby shampoo.

A little kids pool is a great idea, they will more than likely be in the pool all day.