Track vet makes 99% of all post parade/immediately prior to start decisions on scratching. They just make a radio call to stewards and say this ones out. Stewards don't argue with the track vet. And as stated above it's extremely rare, so much so that I would think you'd have a hard time establishing any real usable statistics from it. It's only happened to me twice. Once with a lightly raced horse that was probably 15 to 1 and she finished mid pack. One was with a solid horse that was 6-1 and he won after breaking through the gate. Out rider snatched him up immediately. It was more a fluke deal than him being a jackass or anything like that. Didn't really affect him at all.
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