Hi. Would anyone recommend using a professional person to spray a really strong herbicide onto docks in a horses's field? Can you give me an idea of how much it would cost? I keep 2 ponies on a field. Half of the field is covered in docks. I can't move the ponies to another field to spray all the docks so every couple of weeks I fence off a small area that is dock-ridden then spray with SBK. This does kills them but inevitably new docks then grow in-between the dead docks. They are driving me mad. Suggestions please. thanks.