I have a 3 y/o (as of June 20th, 2012) Irish Sport Horse. When I bought him he was two months ish from turning 3 and was 15.3 hh. He is still this height and has not grown a smidgen. Dam (tb) stood at 16.2 hh, and the sire (RID) at 16.3 hh. The grandsire on his sire's side stood 17.1hh. I have...