I have a Sydell's walker - Handles 4 lambs/goats. The adjustable front leg supports allow the lambs/goats to walk on their rear legs on natural ground, not so with a treadmill. A special motor/gear drive unit with a 30 minute timer gives you a 2 mph speed to build up those muscles. This unit costs considerably less than a treadmill. Lambs / Goats can be hooked up easier than on a treadmill.
I have photos Just cant get them to load. I am in North Texas