I feel like my bell boots for my horse might not be small enough...She is 15 hands and she is right on the line for medium or small, so I picked medium bell boots. But after I velcro them on, I can still twist them a little bit and it seems like they drag on the ground a little bit ( they have grass and dirt stains on them and I only used them once) and when I take them off, it looks like it was rubbing her a little...? What do you think? Would a small be too small or is this how they're supposed to fit??