The argument has gone away from the strongest argument in favor of using lasix, and why the veterinary world strongly supports it's continued use, and why it's used for training works in the countries that ban it on race day: it helps protect the race horse from lung damage. It is good for their health, with little downside.
Can we race without it? Sure. But horses won't be able to run as fast, as far, or as frequently. Not due to performance-enhancement, but due to increased level of side effects from chronic lung damage.
Before we used lasix, horsemen used to not allow horses to drink water for 1-2 days before racing, in order to dehydrate them. Far better one lasix injection is used to protect the lungs short-term during the work or race.
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"Have the clean racing people run any ads explaining that giving a horse a Starbucks and a chocolate poppyseed muffin for breakfast would likely result in a ten year suspension for the trainer?" - Dr. Andrew Roberts
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