Well, even as far as quarter horses go, there isn't one set type; there are the thicker bull-dog type quarter horses, the taller leaner thoroughbredy type, and many variations in between. I have a quarter horse gelding, he takes after his racing bred sire more than his pleasure bred dam, his Paint half-sister is built more like their dam than he is.So, which 'full-sized horse' are they referring to? An Arabian, a Quarter Horse, a Thoroughbred? Which one?
1) Araby - flat croup, dishy face, short coupled body, high tail carriage
2) QH like - compact stock horse body
3) Thoroughbred like - tall, lean, long legged