So I've been helping my friend school her pony she bought for her 10yr old son. He's 13.3hh and 10yrs old. He was broken in a 4yrs old but not properly, he's literally just been taught to follow another horse. Every time I've ridden him in the paddock he refuses to walk in a straight line, he keeps going sideways. He's pretty hard to get into trot and canter aswell, takes alot of kicking & encouragment. Any ideas to help me with him? It gets a little frustrating constantly going sideways.