Dub was dog who gets blamed for Buck's thievery.
Joining sled team
Once when wild dogs attacked camp, Dub hind leg was badly injured.
Later, Dub and other dogs(including dogs from police camp) started chase rabbit, but soon rabbit chase turned in Buck and Spitz fight, where Spitz fell on snow and Dub with other dogs teared Spitz apart.
Dub's owner later become A Scotch Half-Breed, when Perrault and Francois get job somewhere else. Working for Half-Breed was hard for him and other dogs. One day he and other dogs see how Half-Breed shoot Dave to death, because Dave couldn't pull sleds anymore.
After A Scotch Half-Breed needed new dogs, Dub owners become Hal, Charles and Mercedes. Who first overfeed and that underfeed him. Also Dub needed pull heavy loaded sleds with useless of things and because of that Dub lost all his strength and was shooted by Hal.