Most likely a Quarter Horse.
Harry Morgan
Sophie
His Horse Sophie
Colonel Potter left his horse Sophie with the children at the orphanage.
Sophie when Hawkeye, B.J and Radar found her in a feild where she was hurt.
Techumseh
Colonel Potter takes over after Henry Blake.
Lieutenant Colonel
Lieutenant Colonel
Lieutenant Colonel
the caloric mash will boost your horse's moral of 10%
Roger Bowen played Lt. Col. Henry Braymore Blake in the 1970 MASH movie.