What Does It Mean to Pee Like a Racehorse?

Have you every heard the expression “I have to pee like a racehorse”? Do racehorses pee any differently than other horses? Actually they do, read more to find out how to whiz like a racehorse.

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Hang on to your bladder.  Before we talk more about peeing like a racehorse, we need to understand a bit about racehorses in general. 

Due to cheating in the horse race industry, racehorses are tested for drugs. The horse is led into a special stall and under the watchful eyes of a steward, has its urine collected. Nobody wants to be standing around for hours waiting for a horse to pee. To stimulate the racehorse to urinate usually all one has to do is to is rustle some straw beneath the horse and it will stretch out and pee. This method is used anytime a urine sample is required from a racehorse, or to have it pee at a convenient time.

File:StateLibQld 1 124711 Rearing racehorse, Brisbane, 1939.jpg

photo source

Now.. you can combine this with the fact that racehorses have to drink a lot of water to keep their body in peak physical form and you see why it might just urinate with some force, and volume. A racehorse would typically urinate every 4 hours, producing up to 2 gallons of urine a day.  No matter what, you will never piss like a racehorse, humans only urinate a quart or two per day.


Some drugs are legal to use on racehorses, but one drug, Lasix (although legal in certain amounts) was once used to get horses to urinate more than they should before a race. The theory behind the use was that if the horse peed enough it would be lighter, and therefore, faster in the race. Indeed, Lasix is a diuretic. Today it is controlled and used to stop horses from bleeding from their nose during a race.

The saying “Whiz like a racehorse” undoubtedly came forth from the time when Lasix was used as a diuretic to make racehorses pee more than usual.

Worth noting is that horses who race on Lasix have it noted on the racing form.  First time Lasix users usually are noted with a 1L, and after that just an L, typically once a horse is given Lasix for a race, they are always given Lasix for future races. 

Other Links on Racehorses

Why do Thoroughbred Racehorses Die at the Track

Thoroughbred Race Horses; Life After the Racetrack?

As a side note on horse pee, did you know that some drugs are made from using the urine of pregnant horses?  You can read more about PMU horse farms here.

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  1. Posted July 27, 2011 at 1:06 am

    takes more than the rustling of straw to get me to pee like a race horse . . . interesting bit of trivia

  2. Posted July 27, 2011 at 1:51 am

    This is very interesting. Thank you for the sharing.

  3. Posted July 27, 2011 at 3:53 am

    Doesn’t seem like less urine would make a horse faster. What it a myth maybe. And to drug them for it? Poor horses and too many drugs. At least they don’t do it anymore. Interesting post and pic.

  4. Posted July 27, 2011 at 11:40 am

    Sounds like me when I take my water pill!

  5. Posted July 27, 2011 at 6:07 pm

    What’s the difference between peeing like a racehorse and a russian racehorse?

  6. Posted July 28, 2011 at 2:04 am

    I take Lasix does that mean I really do pee like a race horse?

  7. Posted July 28, 2011 at 2:27 pm

    Fascinating, I am not knowledgeable about race horses, so it isn’t surprising that I hadn’t heard this before. I learned something new, which is always good.

  8. Posted July 28, 2011 at 5:31 pm

    I never knew this about racehorses. Very interesting. Thanks for sharing.

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