The dogs must also be affectionate and have a love of running. There are several things that set lead dogs apart from the rest of the pack. Each musher looks for different things, and has their own way of choosing and training their lead dogs. Some things that they agree on are intelligence, aggressiveness, desire, and a good spirit which inspires the rest of the team. They also seem to sense the responsibility they carry, and are able to perform well under pressure.
Lead dogs are especially responsive, mentally tough, and doggedly determined.
Running an average of 7-12 mph during a race, and faster at the race start, these dogs have no first or second gear.