The only thing I would add to all the other ideas listed here is to provide chilled or frozen fruits and veggies. Today the girls got a pint of fresh frozen blueberries, I also keep tupperware containers full of watermelon and other water rich items.
Mine have a shade cloth covered run that it under several trees, fans 24x7, frozen water jugs, and a mister system in addition to the frozen treats.
Mine have a shade cloth covered run that it under several trees, fans 24x7, frozen water jugs, and a mister system in addition to the frozen treats.

