In the horse catalogs, they sell a mister that clips to the front of a square box fan, and hooks up to the water hose. All 6 of my horses have one, and they love it. I have one in the chicken run and they all spend the hottest part of the day around it. I hung the fan horizontally, and up high, and it blows down on them. They are seldom directly under it, but never far away. The difference here, (West Texas) is that we have almost no humidity( 6% today), and thought it was 105 today, we almost always have a breeze, and it doesn't feel that hot. The moist moving air feels wonderful! As long as our kids have a respite from the direct sun, they all do OK. My Great Pyrenese is still in full coat - I just keep her brushed out and she is faring very well.
The misters are worth looking for. I got mine from State Line
The misters are worth looking for. I got mine from State Line