This article is from the Working Dogs FAQ, posted to rec.pets.dogs newsgroup. Maintained by Cindy Tittle Moore with numerous contributions by others.
The name of the game here is truly the harness. As discussed above, the weight pulling harness is completely different from the x-back harness, and THEY ARE NOT INTERCHANGEABLE! The weight pulling harness has side lines that connect to a spreader bar at the hock, instead of continuing up to the hips. This is important, because a single dog weighing 60 lbs may pull 2000 lbs!
Other equipment
Many mushers have a wheeled cart for training in the fall prior to snow fall. In areas with insufficient snow, these carts are used in competition. These can be purchased or made by a good welder. Carts are a lot of fun, but are difficult to come by, they can be difficult to control, and they go _very_ fast with enthusiastic dogs.
Some people use pulks in the snow and carts in the summer to work their dogs. Carts are small "wagons" that are used to haul small loads or children. Pulks are carts for the snow (they are like small sleds). They are used to carry equipment. Carts and pulks can be made or bought.
 
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