Our neighbor had one similar. He raised miniature horses and had national/world champs. Every so often, one turns out like this dwarf. Usually the legs are pretty bad, a happy note for Koda that his legs weren't so bad they couldn't be kind of fixed.
The link provided shows what great miniature horses look like. Typically the best look like very small Arabians. Buckeroo was raised down the road from me and being a normal horse-crazy girl, I was fortunate enough to be around him and a lot of his progeny. He was sold over 20 years ago for $100,000.00, which was a record for that time, if I'm not mistaken. But if you look at him or ever saw him at show, you can see why.