So did you do it? I'm on the edge of my keyboard in anticipation.
I hope he says you can go. But if he doesn't, don't feel badly. My kids made many elaborate presentations thinking that their hard work and showmanship would change my mind...and it didn't. It sometimes made me feel badly about saying "No", though.
I campaigned my entire childhood for a trip to Disney...didn't go until I was an adult. Win some, lose some.
You should try asking for a horse next spring. Spend the whole winter building up to it. Read Black Beauty and tell your family how much you loved it. Start reading all kinds of horse books. Share interesting stuff you learn about horses with your parents, like you're fascinated and excited to share. "Isn't that amazing?!" is a good phrase with which to follow up your info. Leave info about horses that you printed from the internet laying around the house. Rent that horse movie everyone liked so much. Watch it several times. Then, in the Spring, ask. Beg. Plead and whine. Hear "No" at least four times. Then, finally, explain that while you're very disappointed, you understand. You'll get a horse when you're grown up and can afford it. Choke back a few tears while you say it and then run off to your room in an "I don't want you to see me cry" kind of way.
When they're feeling badly about breaking your wee little heart, give it 10-14 days and then ask for a trip to Disney with a list of how cheaply it can be done.
Off to Disney you will go.
Or you'll get a horse.

Either way, you win.