I'am sure not every dog hunter out there has or can afford a tracking unit. Silverton, most of these farm fields in the location are only seperated by a ditch, and the same farmer might have the field on the other side of the one you need to cross. I don't leave any dogs in the field if I can avoid it. If for some reason I have to leave one I'll call and let the farmer know that it is still out.
I agree with some of your other posts and do not know the situation and/ or the hunting terms of this particular situation. If a dogger (especially a hog dogger) cannot afford a tracking unit of some sort...IMO they do not need to be hunting.