This is another one of those topics that doesn't make much sense to me. The way that I grew up, a pony isn't necessarily decided by a horse's height. A pony is more considered a breed. Shetlands and welsh (though we never see them around here) are what I call ponies. If a horse is an actual horse like a QH or a TB or whatever else, then they are a horse, regardless of height. We had a little QH mare for about 20 years that I don't even think broke 14hh but I would never have dared to call her pony. She could outwork any horse twice her size and when my brother held a footrace at the feedlot he worked at, she was 19 years old and 8 months pregnant and she still whooped all the other horses. LOL.