Answer:

Yes. "Breaking down" would be sustaining a fatal or at least career-ending injury during a race. Because of the very fine bone structure in the legs of thoroughbreds and the pounding that their legs take during races and work outs, several racehorses have sustained fractures or breaks in their legs. (including the famous horses Eight Belles, Ruffian, Big Brown)

First answer by Bahr. Last edit by Bahr. Contributor trust: 10 [recommend contributor recommended]. Question popularity: 2 [recommend question].