Yah, I can relate to your experience with unexpected size..... I adopted a PMU yearling and was told he would probably be around 16 hds. When grown. He's 4 yrs. Old now and 17.3!! We all love him to death though and despite the extra money spent for feed, shoes, larger tack and now needing a taller, longer horse trailer, we wouldn't trade him for the world! He has the best personality. There were some paint-marked Belgians in Canada where he came from, probably crosses so if she's a cross then maybe there's some paint in her background.