My daughter's horse, Moonshine, was a terrible duck-er in-er, so I have some experience here. The instructor we liked best first assessed whether Moonshine understood what was being asked, whether she was scared for some reason, and whether she was physically able to stay on the rail. Once she determined that Moonshine was, she tried a couple of different tactics. Generally, you want the horse to be able to leg yield well, so you work on that. Then, if she tries to duck in, you apply leg pressure to stop it. Moonshine could not have cared less about leg pressure at that time. So the instructor took a somewhat harsher approach: every time Moonshine ducked out, my daughter was to yank the outside rein, hard, to the outside, to make her stay out. But otherwise, daughter was not to use leg or rein pressure. This instructor was like, "Moonshine understands what we want from her and is capable of doing it, so we're going to make it HER job to stay in the rail herself. If she doesn't, she gets a quick reminder." This worked really well.
I would also add that school horses tend to do this a lot, for many reasons that I don't think I need to go into. If you are a good rider and you become this horse's only rider, you should be able to change it. If you're not a good rider, you could make it worse.
I'm confused what you mean about her nipping when you put in the bit. Can you describe exactly what you do and what she does? FWIW my Pony went through a phase of not wanting to be bridled, but I got him over that in two sessions by rewarding him with alfalfa pellets for letting me put it in. Now, he gets so excited when he sees the bridle that he starts dancing around waiting for me to ask him to put it in. I just hold the bridle up, and he picks up the bit himself and puts it where it needs to go in his mouth. However, depending on what exactly you mean by your horse nipping, I'm not sure giving treats would be an ideal situation here.
Hmm... I guess I need to add... if your parents don't think you're responsible enough, then fixing these issues is currently irrelevant. You need to convince them that you are responsible before entertaining thoughts of leasing this horse.
"Saddle fit -- it's a no brainer!"" - random person
Last edited by ACinATX; 07-15-2020 at 01:01 PM.