Those are big yippy dogs. I mean BIG.
18-22 inches, 45-70 pounds...more like medium sized dogs and a propensity to get fat. Put that much hair on a medium-sized dog and it appears much larger. And I've seen some Chows that I know had to be considerably larger than standard. There was some guy that used to haul a couple of them around in the back of his full-size pickup...wasn't much room left back there.
