I have a thoroughbred that will be a yearling next week. He is 13.1 at the withers and his butt is 14. When he was just a few months old, the vet came out and said he would probably mature to 17HH. I personally think he is a little short and I have had a few people say the same. His mom is 16.2 and father unknown. Anyone out there with throughbreds have an idea on possible heights at full maturity?
I've posted a pic of him at 1 day old and from today.