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Dog cart during Mardi Gras in New Orleans
Carting is the dog sport or activity of carting, in which a dog (usually a large breed) pulls a cart filled with supplies, such as farm goods or firewood, but sometimes pulling people. Carting as a sport is also known as dryland mushing and is practiced all around the world, often to keep winter sled dogs in competition form during the off-season.
A variety of carting is sulky driving, where a dog or dogs pulls a two-wheeled cart (sulky) with a person riding in the sulky. This sport offers both exercise and discipline opportunities for energetic breeds. Many working breeds are happier when given a job or task, and carting / sulky driving can be a rewarding hobby for both dog and owner.
Dogs from 15 kg body weight and upwards are able to pull an adult and a sulky comfortably. The general rule is that the total load (sulky and driver) should not exceed three times the weight of the dog doing the pulling. If, for example, the sulky and driver totalled 150 kg, then the weight of the dog pulling would need to be at least 50 kg. Smaller dogs may be used as long as the cart is of a type which can handle multiple dog draft, and the combined weight of the dogs pulling is at least one third of the load being pulled.
Dryland mushing is distinguished from sulky driving in that the cart, or dryland rig, is attached to the dog in the same manner as a team to a sled. The cart has three or four wheels, with the driver either sitting or standing, depending on the cart construction. The International Federation of Sled Dog Sports sponsors one of the largest dryland mushing events in the world, the IFSS Dryland World Championship.
An Introduction to Dog Carting 
Regal Mini Sulkies (commercial sulky site)
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This guide is licensed under the GNU Free Documentation License. It uses material from the Wikipedia.