[Riot]

Originally Posted by letswastemoney

It seems like an abnormally large amount of thoroughbred race horses die of a heart attack

That's awful about Hennessy.

"Heart attack" is sort of a catch-all term. Not really the "heart attack" as occurs in people. In horses most usually they have an arrthymia (irregular fatal heart rhythm), or dissecting aortic aneurysms are not uncommon. Both can cause a horse to drop suddenly without warning.