The POA mare I had I would pony with my mare when I would have a need to do it. Neither mare acted "marish" with one another. The only other horse I ponyed with my mare was the TWH I had. I learned from him to never have a longer than absolutely necessary lead to keep a ponyed horse's head at my knee and most favorably at the left knee. He had obviously never been ponyed before and was not actually certain of what was expected of him, but my level-headed mare handled herself very well in dealing with him. At least my 2 horses and I didn't encounter any serious problems, but I learned to try it at home first then go on a road ride with them.