I recently purchased a 9mth old Clydesdale sporthorse filly. Her dam is 15.2hh and her sire is 17hh. Is there a method to determine her adult size? After googling I came across info which states if you measure from the bottom of the fetlock up to the elbow and then pretty much double that measurement you will come up with the adult height. Has anybody used this method and does it work? My mare came back with an adult height of 15.3hh which I do think is highly likely.