Here is a great article done by the National Show Horse folks. The Saddleseat Discipline
It primarily a light breed seat. You rarely see a stock type in SS tack unless they are packing kids or beginners. My first "show horse" was a big fat quarter horse. You can learn the seat on any breed or type.
Definitely look around that video link above, HQ. There is a program on there where you can get a free lesson if you want to try it. Posted via Mobile Device