I realy want another horse but...?

Just say, Dad I've been thinking and I'd like a new horse. Say that maybe you'd do extra chores or some thing in exchange and/or say it would be a great Christmas present (as Christmas isn't to far away) Point out the positives of having a horse like responsibility. And if you do eventually get your horse NEVER take it or your parents generosity for granted. Maybe try another Thoroughbred or part Thoroughbred because you have previously owned one. One of the horses I ride is a Belgium warm blood and are calm and great confidence givers and are in your height range ( the one I ride is 16hh) I'm only a beginner rider but he really boosted my confidence. Hope I could help!