Breakdowns on Big days

[Danzig]

i've heard of horses getting injured during a routine gallop in the morning, i can see that it would happen after a race during the gallop out as well. just because it's rare doesn't mean it can't happen.
i believe what a song broke both legs during a morning gallop. anyone who knows horses, or has been around them, knows they can suffer some weird injuries that you wouldn't think could happen.
hell, look at st liam at the farm. just walking, gets antsy and ends up falling and breaking his upper leg. a horse a few years ago lost his balance after breeding and broke one of his withers. when had anyone ever heard of that before? i hadn't.