Normal temperature for a resting horse is 99.5° to 100.5° F (37.5° to 38°C). During a workout, the temperature may rise to 103.3°F (39.6°C) but should not exceed 104.9°F (40.5°C). The temperature should fall quickly when exercise has stopped. If the temperature remains elevated for too long, the horse may not be sweating properly. A rectal temperature of greater than 104.9°F (40.5°C) is serious and steps should be taken to cool the horse quickly. Keep in mind that every horse can overheat when it’s too hot and humid or conditions are unsafe to work a horse.
When in doubt about sweating, check the horse’s temperature again, especially if it has been shipped to a new climate or as the seasons change. A horse that sweats well in winter can become a non-sweater in summer.
2) Look for signs of sweat over the horse’s entire body, even the lower legs
After a good workout, a horse should sweat everywhere, even on its lower legs. If you don’t see sweat there, the horse isn’t sweating as well as he should. If you’re not sure, exercise with horse boots or wraps so sweat can accumulate and be easier to see.
Horses in arid climates may sweat well but the evidence evaporates so quickly, it’s harder to see. After a good workout, however, a properly sweating horse in an arid climate will accumulate sweat under the tack and even under boots on the lower legs.
3) Be alert to other conditions. They may indicate that sweating is the real problem
Labored breathing is a natural response to overheating and can be misdiagnosed as a respiratory issue or the result of poor fitness. Always check for signs of poor sweating and treat that first.
Sweat contains salts that have an antimicrobial effect on
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