constantly cooling the body. If you put water on the horse, it evaporates quickly. Be aware of weather conditions
and weather predictions, especially heat-humidity index. Don’t work a horse hard when temperature and relative humidity together are dan- gerously high. A rule of thumb: when tempera-
ture and humidity numbers are added together and the total exceeds 130 (as when it’s 80 degrees with 50 percent humidity) there’s risk for overheating. If the total number is 150 or
higher, this is the danger zone — any working horse will probably overheat. For instance, if tempera- ture is 90 degrees the horse may get into trouble if humidity is 60 percent, or even at 80 degrees if the humidity is 70 percent or higher. When humidity is high, the horse
may overheat at a lower tempera- ture because he can’t get rid of the sweat and is unable to cool himself. “One of the things we learned
while doing studies for the Atlanta Olympics is that if it’s lower than 75 degrees it doesn’t matter what the humidity is,” says Allen. “When air temperature gets above 75 degrees, it does matter,” he says. Some horses are more at risk.
The larger the body, the more dis- advantage in dissipating heat. “Body fat insulates and retards heat loss, but body size is also a factor. Even within the same breed, a small Thoroughbred or Quarter Horse has the advantage over a bigger one,” Marlin says. The smaller animal has more body surface per total body mass. Large horses, fat horses, heavily
muscled horses and heavily preg- nant mares don’t dissipate heat as
well as small, lean horses. “In any horse, heat must dissipate from the body core, all the way out — through the lungs or skin,” says Fleming. “The more bulk, the more problems.” A fi t horse usually does better
than an unfi t fat horse, but in some instances the fit horse might be more at risk because he has a high- er capacity for exercise and may keep going longer. “Sometimes unfi t horses save themselves by quitting early,” says Marlin. The horse most at risk for heat
stroke may have a high tempera- ture, but could also be a horse with moderate temperature that has been exercised for a long time. “Or it could be a horse that’s been exer- cised continually or periodically (such as at a horse show, or work- ing cattle) without enough water to drink,” he says.
ae Y 4
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