If they are working really hard in almost any temperature they will feel some heat! So doing a polar plunge is so natural for them when they are really going at it hard. So when conditions warrant. I'll try to let them get their lower paws and pads wet. I'll look for shallow spots or fill a vat no higher then what would be their knee height or so that way they can't get soaked higher up their body as in freezing conditions the water could freeze on their fur and cause other serious problems.