Harnessed dogs pull carts/sleds on wheels, rails or show. The cart/sled must be pulled a prescribed distance in a defined time. A qualifying "Pull" is dependant on a dog pulling a defined weight and other factors in accordance to the rules, as defined by the UKC. Dogs are scored based on how much weight can be pulled by body weight - even the tiniest dog can pull!!
For a complete list of UKC rules - click on the logo below: