Synthetic tracks are the way to go.

(Image Source: http://www.collegiatehorsemen.org)

To ensure less breakdowns of horses and permanent injuries on the fragile legs of thoroughbreds caused by harsh dirt tracks, several race tracks are converting their tracks by replacing hard compact dirt surfaces to synthetic surfaces.  Synthetic surfaces are easier on the horses legs as they travel over 40 mph to the finish line.  Here's an article explaining this innovation to prevent the neglect and injuries of horses in the racing industry.


http://www.slate.com/id/2164047/