This is PawPaw’s Dog Treadmill: an exercise machine that gives your pet a good workout. It is height adjustable and can handle up to 220lbs of weight. It is non-electric, so your pet is not forced to run when she doesn’t want to. You can manually stop this with your hands or feet.
PawPaw’s Dog Treadmill can handle dogs withers height up to 29.5 inches. You can find out more here.