I think the opposite is true. I mean if you want something close to the original rhodesian ridgebacks. Well the original native dogs maxed out at 30 lbs, but even the colonial mongrel was a lithe long distance running hound of about 60 lbs. A lot of the modern ridgebacks have been inflated by the show crowd and outcrossed with bullmastiffs and the like, and now wouldn't stand a chance in hell leading the lifestyle that shaped the breed.