What would be the maximum height a 13hh pony could jump?

Well my loan pony is 13hh too and the highest he's jumped is 90cm, but that's when the owner decided that that's enough. He is very athletic though, has millions of red rosettes so don't feel you have to push your horse too much further. I don't know about your pony but Justin has very short legs! If you normally jump higher then think about riding a different size of pony. Me and Justin normally jump from 70-79cm now...