A hot humid day. One rider. One horse. Both are exercising at a moderate level. Who is more likely to overheat? It might surprise you to learn that your horse gets hotter much faster than you and is more susceptible to the negative effects of heat stress. Prof. Michael Lindinger, an animal and exercise physiologist at the University of Guelph, explains: “It only takes 17 minutes of moderate intensity exercise in hot, humid weather to raise a horse’s temperature to dangerous levels. That’s three to ten times faster than in humans. Horses feel the heat much worse than we do.”

It’s a beautiful day to head out to the mountains for some playtime. You grab your horse and tack and head out in the afternoon for a quick ride to your favourite spot. It’s 28 degrees Celcius and you don’t see a cloud in the sky. You grab a light windbreaker for “just in case,” get on your horse, and soon you’re enjoying the peaceful sights, sounds, and smells of the forest.

If you’ve ever been to a gym after a long absence or started up a new exercise routine as part of your New Year’s resolution, you have a good appreciation for the importance of gaining and maintaining fitness. The same concept applies to your horse when you put him back into training after giving him the winter off, after a layoff from an injury, or when starting a young horse under saddle. Unfortunately, many horse owners and trainers are concerned only with working their horses over obstacles or schooling maneuvers specific to their sport, rather than ensuring their horses are fit enough to perform such tasks.