Was just about to say the same thing. Here's an example of frighteningly fit pit bull on one.

Unlikely human treadmills, they're self-powered, so the dog can stop when ever it wants. We've been thinking of getting one for our Staffordshire Bull Terrier puppy (also named Angus), as 45 minutes of walking a day isn't cutting it (that and we're thinking of showing him).

Here's an example of what you can achieve with a slat mill, a spring pole, and good genetics. Looks scary at first glance until you realize staffords top out at under 40 pounds and are typically friendly to the point of being comical.

I'm definitely not watching this. I want my reality handspun and pre-interrupted. Government approved. Give me simple sound-bites and colorful graphics; something disturbing enough to make me feel fortunate it’s not me, but not disturbing enough to make me do anything about it. This is horrible--I'll pray for you.