Oh you'd be surprised!! Lol There are so many factors from clipping to head height to leg placement.Just so we are all on the same page! It's not "rocket science" as they say.
Horse's height must be verified on a hard, level surface, preferably concrete or paved, in a public place, by a Show Official and witnessed by a member sponsoring the show. No person with horses being shown competing in the show may be a measuring official at the show. The measuring device used...www.amha.org