You must remember, that obedience is very important for the safe life of you and your Rhodesian Ridgeback. Please, contact professional trainers, read the literature and make your own decision, according to what do you want from your dog. But firstly — obedience course. You must be serious in this matter. After obidience you can choose any sport activities — adjility, lure coursing, frisbee, freestyle or just enjoy the life with you beloved and obidient ridgeback.