In honor of the Kentucky Derby, an answer to

The question we're all asking ourselves.  From Slate.

Does a Racehorse Pee Like a Racehorse?
Wait, how much does a racehorse pee?

A lot. Horses typically produce several quarts of urine every four hours, for a total of about 1.5 to 2 gallons per day. (By contrast, an adult male human pees 1 or 2 quarts per day.) The stream, usually one-third to a half-inch in diameter, can last up to 30 seconds. In general, the larger the animal, the more it pees. A Clydesdale, for example, weighs twice as much as a Thoroughbred and produces urine in greater volume (and with a more pungent smell). An average pasture horse that spends its day grazing might also beat a racehorse in a peeing match: Pasture grass contains a lot more water than the carefully prepared grains and pellets fed to racehorses.

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