| PETA is calling for suspension of the jockey and trainer. I would assume vets and officials will be going over the tapes very very carefully to see if something may have occurred earlier.
I know nothing about horse physiology, but aside from the "bred with too delicate bones," and the hard-racing surface theories, I also heard someone report recently that when a horse is completely exhausted, it's muscles are spent and can't function, so the stress and work of the leg then falls to the skeleton, which in some cases is just too much. That seems to make sense.
Poor thing. | 
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