It's time to slip in the old "conscientious ettiquette policy" reminder. This policy was created both for the general responses AND the OP. Please understand that when asking for someones thoughts on a forum, you are going to get them and they aren't going to all be sunshine and roses. However they are expected to be respectful, please do not attack the OP and vice versa.
That being said, I know that certain breeds are mixed in order to create an exceptional sport horse such as the arabs will breed with many breeds, and are accepted as half-bred registries, quarter horses will breed with TBs to get an appendix and so and so forth and then when you are breeding for a pony I think registration doesn't always matter.......
"Be a best friend, tell the truth, and overuse I love you
Go to work, do your best, don't outsmart your common sense
Never let your prayin knees get lazy
And love like crazy"