It's basicly "like" sled pulling. You put a sled harness on your dog and attach the towline to the front of your bike and let your dog pull you! Have you ever heard of cross country skieing with your dog or skiejoring? It's like that.

Here are some links.

Here is a link
http://www.skijornow.com/bikejor.html

This has good pictures of it
http://www.geocities.com/jose_marinh...joring1e2.html

Ash