12-23-2013, 07:12 PM
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Its hard to say how big a horse will get it's all up to genetics and feed. And here on the forum its hard for us to say how big your horses will get. However, knowing how they are we can help you understand when you might be able to ride them more. The hard question to ask is "how big/small are you?". You told us your horses are roughly 13ish hand well if you are 4 feet tall and 75lbs then you wouldn't be much of a load for your horses, but if you are my size, 6ft 5in 250ish pounds then you won't be able to ride you horses very much.
As for going under them as someone already said that's a bad idea. Its a great action trick at is used to show how quiet a horse is. However. All it really shows is that you can go under them it doesn't mean that if a paper blows under a fence that the horse won't blow a gasket.
We will need more info. To help you with your questions about your horses. I can tell you that there is a chance your horses might grow more with better feed. But If you really would like better answers I would talk to some horse people that are near you. These would be good questions for you Vet or your Farrier.