Help! I want my horse back!?

Last week, my dad sold my horse. He hated it so, he sold it! Unfortunatly, the people he sold it to were rodeo riders. They abused my horse so it was wild, mean and rotten! I would give them all of the money they wanted, but they just walked away when I asked them! I go and see him every day at that barn, and I can see ches on his legs, stomach, and face! I was planning on sneeking into the barn tonight and running away with him since im the only one he loves, but my dad found the diagram! What should I do?!