If your dog has a lust for life, you might really like a treadmill for days when a quick winter walk just isn't going to cut the mustard. Physically confident dogs can take to them almost immediately (Star did!) Other dogs need days or weeks of mini-sessions around and finally on the mill before they feel comfortable enough to jog with joy. Once they get it, you can get them dog tired in just 10-20 minutes time. Priceless.
The video shows a (dog powered) carpet mill. We've had the most experience with these, although some homes like the motorized treadmills. If you do a search on Amazon.com for 'dog treadmill,' a few motorized options will pop up. We prefer the quiet of the dog powered mills. The one in the video is a Grand Carpet Mill. We can also recommend the Colby Carpet Mill.
One harness option comes from the sled dog folks - here - and the one Star was filmed in came from here.
Many thanks to Letti de Little for the demo, and to Uba for loaning his precious mill to Star while he recuperates from knee surgery.