Every year, about 17,000 Thoroughbreds are born in North America. Let's assume half of them are colts: 8,500 male horses bred with ambition in their blood. Of those, maybe 50--if we're being generous--will ever make it to stud. The fillies often retain value as broodmares, but even then the industry quietly accumulates thousands of horses every single year whose careers end without a clear path forward. And for far too many of them, that path ends at the slaughterhouse. We talk about racing fatalities in terms of breakdowns on the...