I just bought a mare and she's automatic when you ask for her front feet but when going to the rear she squats (leans heavily) on the side that you want to pick up. She will do this if you just rub her on that side in the rear. I don't know what this could be. She doesn't move away, she just puts all of her weight there to the point where it looks as if she's squatting on that side in the rear. I was told that she wasn't handled a lot. However, I need to get through this so I can have her shoes replaced. Any advice would be highly appreciated.