| A | B |
|---|
| Buck | Protagonist; Southland dog |
| Miller | Buck's original owner, judge |
| Santa Clara Valley, California | Buck's home for the first four years of his life |
| man in the red sweater | taught Buck law of club |
| Curly | her death taught Buck law of fang |
| Francois and Perrault | French Canadian government couriers |
| Spitz | Buck's enemy, fought for leadership of team |
| Dolly | dog went mad from rabies |
| Manuel | gardener's helper, stole Buck |
| Scot | new owner after Francois and Perrault |
| Dave | injured dog who wanted to die in the traces |
| Hal | young man, ignorant of dogs and Northland |
| Mercedes | Hal's sister |
| Charles | older man, married to Mercedes |
| John Thornton | rescues Buck, loves Buck as his child |
| Northland, Gold Rush | setting |
| Buck vs. weather | character vs. nature |
| Buck vs. Spitz | character vs. character |
