No. Only one musher and 16 dogs are allowed to run the 1,161 miles. No replacements if a dog get injured either.
The people who control a dog sled are called mushers. They stand on the runners at the back of the sled and give commands to the team of dogs to steer and control their speed. Mushers must have good communication with their dogs and be skilled in navigating the terrain.
"Mushers"
The term is often used for people who guide a dog sled.
The mushers have baskets that carry the gear on the Iditarod Trail. These baskets are used to let the dogs rest while on break.
They freeze to death once they're stranded by not having any dogs to pull their sled any more.
They run all year and slowly increase their distance and speed each time they run. ( they are still using a sled to pull the musher)
there are usually around 60 people in the iditarod each year
In sled dog races, drugs are not allowed that would improve the strength or endurance of a dog. Other drugs, such as some antibiotics, may be restricted as well.
A snowhook is a tool used by mushers in dog sled racing to anchor their sled when the team stops. It is typically a metal hook that is buried in the snow to hold the sled in place, allowing the dogs to rest without the sled moving.
"Mushing" refers to driving over snow with a dog sled. One or more dogs pull the sled, with the "musher," the person standing on the sled, on board. The word "mush" comes from the French "marchons" or "marche" meaning, "let's go" or "go."* http://people.howstuffworks.com/musher.htm
A sled dog's life typically involves rigorous training, daily exercise, and working in a team to pull a sled. They are well-cared for by their mushers, with proper nutrition, healthcare, and grooming. Sled dogs thrive in colder climates and are happiest when they have a job to do.
The force of friction is proportional to the force which surfaces press against each other. Since two people will cause the sled to push harder on the snow then one person, the friction will be greater for two people on the sled.