is it that hard to teach a ridgeback to "tone" back?? if you cant get it to come back on command i wouldnt blame the breed on it. but maybe there is something about them that makes them not heed to a shock collar. i dont know.
i understand the size comment. i would think a big dog may hurt more than help.
if a ridgeback is all a man has i would say go after it. better than having nothing there to give you companionship. if nothing else, just teach it to go out and walk around but not chace coyotes. have a buddy that has a cur dog that does not decoy them back in but will wonder around within a 100 yards and they seem to come in and investigate the dog and he kills alot of them. so i bet there are a million different ways to do it.