No.
There is nothing that humans can do to help the human dwarfs grow to normal size except surgery on a select few bones in a select few types of dwarfism in humans, (ie ACH dwarfism and the surgery to lengthen the long bones of the legs and arms). There is nothing that can help the horses, I really do not think Science or anyone's bank account is interested in that expensive and experimantal endevour with the horses either.
The diseases cause the bones to grow abnormally or not develop at all in to normal functional bones. Therefore, you cant change the genes and how they have been mutated and are encoded to produce proteins that are abnormal. Gene therapy is something that in other diseases is a sci -fi endevour right now. I do not know if it will ever be possible for that in human dwarfisms let alone horses.
John
