This will be fun to watch...

8th Annual Portland Urban Iditarod - Portland Urban Iditarod
In the Alaskan Iditarod, more than sixty dog sled teams race across the frozen tundra from Anchorage to Nome. In our urban version, teams of ‘dogs’ lead by a musher will pull their sleds (shopping carts) through some of Portland’s most scenic areas. These teams of barking humans must negotiate through the unrelenting and unforgiving dangers of Portland’s urban frontier.
As an incentive to run, dogs and mushers alike will have several ‘check points’ to replenish lost fluids and discuss tales of mayhem.