I have two mares that are right at 30".
Velvets Little Shadow Dancer, a.k.a. "Millie", now five years old.
And, her half-sister, Gem Dandys TJ, a two year old.
I also have a long yearling colt from Millie, Songcatchers Little Bitty. He was 17 inches at birth and is currently 27.75. I don't believe he will ever go over 29.
He is very refined and I had planned to keep him as a stallion, but my two smallest mares that I really need a small stud for are his mother and his half sister (TJ, who is also half sister to Little Bitty's mother. What does that make them?
) So, I'm trying to sell him in order to buy another very small stallion. He is my smallest so far.