Their personalities are quite different:
- Dolly:
- A female greyhound-pointer mix.
- Described as gentle, affectionate, and playful.
- Becomes a mother figure to the other dogs, especially Buck after he was severely beaten
- Joe:
- A male bulldog-mastiff mix.
- A powerful and aggressive fighter
- Dislikes Buck at first due to feeling jealous when Sol-leks gives Buck preferential treatment
- Gradually develops respect and camaraderie for Buck as they overcome challenges on the trail together with the team.