We in the south battle the heat almost every year. Winter not a problem , Water just freezes a few days . our plan
1) Good shade the kind where grass will not grow...
2) Fresh , cool drinking water available all the time.
3) livestock tanks or pools with water where they can get in them and cool those feet.
4) a fogger in the big paddocks in shade keep a nice damp cool spot on the ground.
5) a fogger( the kind used in Poultry Houses for tunnel cooling system) in each concrete run ( with roof for shade, no walls) in these runs a fan to move the air. not just anyone will do with the moisture , Schaefer Versa Kool. they move a lot of air. This air movement with foggers provides Evaporative cooling . Can lower the temp 10 degrees with humidity, 15 degrees without.
6) Ventalation and air movement .
Dogs are rotated from runs to paddocks night and morning to try and get exercise. I worry what if the power goes off, with this plan they would be ok as not in a closed in area.