So, I just bought my horse about a month-month and a half ago. When I tried him out he was absolutely GREAT! And the first time I rode him with a friend and her horse, he was absolutely GREAT, considering the fact he hadn't been ridden in a year. But since then he has been acting weird. At first he didn't stop, but I changed bits and he got much better, and then he wouldn't turn, and refused to turn the way I wanted, but I fixed that with some reining exercises and now he tosses his head when I gallop him, and just barely picks his hind legs up, but it almost feels like he is going to buck. Is it a poor fitting saddle? I am trying out some new ones that are bigger in size. I am currently doing some galloping exercises on him to stop his head throwing. And his previous owner said to use a tie down. How else can I stop this? Thanks! And he is a good horse, because he was high dollar, so I know something is wrong, I just don't know what.