I was looking at getting a retired team roping/reining horse as a rescue and babsitter for my young kids. He's super sweet and gentle and you can ride him but he tends to stutter or stall when you turn him right. He doesn't act like it is painful. He's 18 years old. The owner tells me he is stowed up. Is this just a bruising? Poor diet? Permanent lameness? Something that can heal with exercise and diet or vet attention? Or is this something where he should be permanently retired to pasture?