On a nice autumn day, I like to go walking outside with my sweatpants on, being cozy, and admiring the changing leaves color. Eventually I end up walking 5 miles and call it a day. But now, with this contraption, I can go sightseeing for hours upon hours as long as my dog has some form of energy in him. Dubbed "The Original Dog Powered Scooter", the device is a bar on the back of the scooter with a harness that the dog walks into. The dog then essentially pushes you to your destination, but allows the human to keep the steering and braking under control. It's about $500 for the whole package and you can get an accessory to add another dog. See? Man's best friend = Man's locomotion slave.
The Original Dog Powered Scooter [Treehugger]