Never heard the term "rig" used until i moved here to Tennessee. A houndsman's term to me. I've worked with cur dogs my whole life and have never kept one that would not let me know if I was traveling, whether by truck, boat, or buggy, within their winding range of cattle or hogs. This I can tell by just watching them or a whine. Barking without looking at one is a death sentence where i am from. We've always referred to this as simple "winding"