There's been around 5000 horse deaths (800+ a year) in racing since 2003. I'm not sure what the answers are, but I would guess things like increasing the age to begin racing and monitoring horse size would be a decent start.
A subject dear to me (greyhounds) involves a much worse mortality rate (thousands a year), yet no one seems to care about those deaths. It seems to me that the well-being of dogs and horses bred for racing aren't a very big concern to society.
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