Where I live in the South, there is often an oppressive heat wave for many days. The challenge is to make your training enjoyable, productive, and safe during hot weather. First, try to ride early in the morning or late in the evening to avoid the highest temperatures of the day. The morning hours are preferable because you have the benefit of the cooler night air preceding them, so the air feels fresher and, in the case of the South, less humid.
When you’ve finished riding, let the horse walk on a loose rein for a few minutes to cool down. Then give it a quick bath, use a sweat scraper to remove excess water, and, if the animal is still hot to the touch, walk it until it is no longer producing steam and its body temperature feels normal under your hand. You can then let the animal graze on a lead line until its coat is dry. If the horse is put into the stall wet, it usually has a hard time drying out, so it begins to roll in the shavings or straw to dry its coat. This makes a big mess and can result in the horse getting “cast” in the stall—that is, as it rolls, its feet get stuck against a wall. In this case, the horse sometimes can’t get its feet off the wall without assistance.
There has been a lot of debate about the temperature of water given to a horse after work—both water that is drunk by the horse and water that is used to bath the animal. There are times when very cold water is used on key places on a horse to bring its temperature down, for instance, during the cross country day of a three-day event. However, horses are not usually reaching extreme temperatures after a routine workout, so in general I would say to bathe a horse in tepid water after a workout.
At a show, I usually leave buckets of water in the sunlight so that the water heats naturally. Even though a hose may be available, it won’t necessarily have anything but cold water to offer, and there is always the chance that you’ll have a hot horse needing a bath at the same time that many other people do, so the buckets are a smart insurance policy.
I think the temperature of the water is also an issue of trust. You don’t want the water to be cold enough that it makes the horse dance around in evasion. If that is the case, the animal begins to realize that you are not a kind person, and it remains overly alert to see what else you might do that is thoughtless. That is a terrible relationship that spills over into everything else you do with the horse, both mounted and unmounted. No matter what the temperature of the air, the bath water should be comfortable and put the animal at ease.
As for drinking water following a bath, either tepid or cool water is fine, but as a rule of thumb, let the horse have no more than half of the typical five-gallon bucket at first, then walk the horse in a large circle (some people walk all the way around the barn), allowing it to take a sip every time it approaches the bucket until it is no longer interested in drinking. The key thing here is to keep the horse moving as it is cooling down. A slow cool-down is always the smartest thing. As I mentioned earlier, once the horse’s body temperature is cool to the touch, you can let the animal graze. This is a nice reward for a horse that has finished a work session and allows the coat to completely dry.