Kentucky's ongoing attempt to end racing in state proceeds..

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Great thread with some interesting viewpoints.
I have seen several horses die after crossing the finish line from a heart attack. Why would this happen to a perfectly healthy young animal? I'm not an equine expert, but if lasix is a diuretic that stops bleeding doesn't that mean it's a blood "thickener"? and if the blood is thicker, wouldn't that make it harder for the heart to pump it through the system causing more heart attacks? Something unnatural about a animal losing so much fluid from the body; there has to be some drawbacks.