Remember the Electrolytes - As we hit the hottest portion of the summer, we’re witnessing our horses’ attempts to keep cool by sweating. The process of sweating causes a decrease in core temperature through evaporative cooling at the skin surface. As high energy molecules evaporate from the skin, releasing energy absorbed from the body, the skin and superficial vessels decrease in temperature. Cooled venus blood then returns to the body’s core and counteracts rising core temperatures.