The American Miniature Horse Association promotes the breeding, use and perpetuation of a standard of equine excellence in miniature. Horses registered with AMHA must meet the Association Standard of Perfection and cannot exceed 34 inches in height measured from the last hairs of the mane.
It is right in the middle of the main banner on the AMHA home page. On my computer it is a tiny icon until you hit the full screen button.
For some reason it won’t allow me to post a link without embedding the video. I added the link. However you will have to remove the space in the https. I added a space between h and t to keep it from converting.