Not primitive as in not medieval. It's not an industrial society, because of the magic. But they could produce highlevel saddles, as long as there's no technological elements involved. Thanks for the links, SeverinR, I'll check them out.
Lower back support and something to secure the legs. I think I get the picture. So I need to find a obedient carthorse for him. This helps a lot, thanks, ArielFingolfin.