The size of the horse doesn't matter. It is the heart of the horse that is important!
I get real frustrated with people when they say that about smaller horses... Just because he isn't a massive 17hh horse, doesn't mean he can't jump well. There is this one horse I have seen at a show. He is only 14hh, and jumps 1,30 - 1,40m.
People must start respecting the smaller horses...why don't we all form a club? LOL ; D