HRQ From A Dummy - Dirt or Turf

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Horse Racing Questions From A Dummy

What are the distinguishing characteristics that makes a horse a "Dirt Horse" or a "Turf Horse?"

Understanding that for some horses, it doesn't seem to matter what surface they run on - but what about the rest? Are Turf horses bigger, stockier, heavier? Is their running action different? Do some animals just prefer one surface over another? Have always wondered but never knew.