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How Do the Sweat Glands of a Horse Work?

The sweat glands of a horse produce sweat when the brain sends signals that cooling is necessary; the signal is sent when core temperature rises above normal. A horse's sweat has a higher electrolyte concentration than human sweat.

Fluid Loss
- A horse's sweat glands produce more than twice as much sweat per square-inch of skin as a human's. A horse loses up to almost 16 qts. of fluid per hour -- primarily through its sweat glands and lungs -- during intense exercise.
Electrolyte Loss
- Thirst is triggered in humans when sweating causes a rise in the blood's electrolyte levels. Horses lose more electrolytes from their sweat glands. Lower electrolyte levels left in the horse's blood do not quickly trigger thirst.
Overheating
- Overheating results if a horse is not producing enough sweat to cool itself, and does not drink sufficient water to replace fluids and electrolytes. A fit horse sweats readily, and loses fewer electrolytes through its sweat glands.

Animals & Science