Conversation so far:
When was Man o'War born?
Man o' War's date of birth is March 29, 1917
Who was Man o' War's owner?
Man o' War's was Samuel Riddle
How many races did Man o' War run?
During his racing career just after World War I, Man o' War won 20 of 21 races

Question: What kind of horse is it?
Self-contained rewrite: What kind of horse is Man o' War?