Changes

'''Curly''': Curly is a Newfoundland that Buck befriends before they reach the Yukon. She is a friendly dog, which sadly gets her killed by a pack of huskies.

'''Curly''': Curly is a Newfoundland that Buck befriends before they reach the Yukon. She is a friendly dog, which sadly gets her killed by a pack of huskies.

'''Dave''': Dave is a morose dog whom Buck befriends before they reach the Yukon. He is grumpy, yet he works his job as wheel dog with pride, a reason why he gets along with the elder Sol-leks.

'''Dave''': Dave is a morose dog whom Buck befriends before they reach the Yukon. He is grumpy, yet he works his job as wheel dog with pride, a reason why he gets along with the elder Sol-leks. Later in the story, Dave suffers from a sickness and is thus left behind in the wilderness, where he dies.

'''Billie and Joe''': Billie and Joe are two brothers whom Francois and Perrault buy after the death of Curly. These brothers are as different as day and night in personality. Billie is very friendly and playful yet cries easily, while Joe is aggressive and grouchy; even Joe was able to keep the bullying Spitz at bay.

'''Billie and Joe''': Billie and Joe are two brothers whom Francois and Perrault buy after the death of Curly. These brothers are as different as day and night in personality. Billie is very friendly and playful yet cries easily, while Joe is aggressive and grouchy; even Joe was able to keep the bullying Spitz at bay.

'''Sol-leks''': Sol-leks is an old dog bought shortly after Billie and Joe join the team. His name means "the angry one", and he hates being approached by his blind side - literally so, since he's blind in one eye. The one dog he gets along with the most is Dave, whom he shares the duty of pulling the sled from the front, and thus doesn't care that Buck gets to be leader instead of him.

'''Sol-leks''': Sol-leks is an old dog bought shortly after Billie and Joe join the team. His name means "the angry one", and he hates being approached by his blind side - literally so, since he's blind in one eye. The one dog he gets along with the most is Dave, whom he shares the duty of pulling the sled from the front, and thus doesn't care that Buck gets to be leader instead of him.

'''Dub''': Dub is an awkward dog who often gets caught and framed at the wrong time.

'''Dub''': Dub is an awkward dog who often gets caught and framed at the wrong time. Once, when Buck slyly steals some bacon from Francois and Perrault, they assume that Dub had stolen the bacon and discipline him.

'''Pike''': Pike is one of the more recent dogs to be added to Perrault and Francois's team. He's known to be a clever thief and a late riser.

'''Pike''': Pike is one of the more recent dogs to be added to Perrault and Francois's team. He's known to be a clever thief and a late riser, and he later resists Spitz's attempts to discipline him under the watchful eyes of Buck.

'''Dolly''': Dolly is the second-to-last female dog added to the team after Curly. She becomes rabid one day and lunges at Buck - the closest dog to her - but is mercy-killed by Francois.

'''Dolly''': Dolly is the second-to-last female dog added to the team after Curly. She becomes rabid one day and lunges at Buck - the closest dog to her - but is mercy-killed by Francois.

===Humans===

===Humans===

'''Perrault and Francois''': Perrault and Francois are the two French-Canadian men who bought Buck and Curly for their sledding team. They are shown to be fair but stern with their dogs, disciplining Buck for his earlier mishaps but also disciplining Spitz for his bullying ways.

'''Perrault and Francois''': Perrault and Francois are the two French-Canadian men who bought Buck and Curly for their sledding team. They are shown to be fair but stern with their dogs, disciplining Buck for his earlier mishaps but also disciplining Spitz for his bullying ways.

'''Hal, Mercedes, and Charles''': These three are an inexperienced trio of greenhorns who buy Buck and his team from the mail delivery. Charles and Mercedes are a married couple, and Hal is Mercedes's brother. Having experience with neither sledding nor dogs, they wear the already worn-down team down even more. Not helping matters is Mercedes loading the others down with tantrums due to having lived a pampered life. They also ignore the advice of John Thorton and other expert explorers, the former warning them about the thinning ice at a river. When Buck doesn't rise, Hal starts beating him only to be punched in return by Thorton as the latter takes Buck under his care, and the greenhorns and what remains of the original team by Perrault and Francois drown in the river.

'''Hal, Mercedes, and Charles''': These three are an inexperienced trio who buy Buck and his team from the mail delivery. Charles and Mercedes are a married couple, and Hal is Mercedes's brother. Having experience with neither sledding nor dogs, they tire the already worn-down team down even more. Not helping matters is Mercedes loading the others down with tantrums due to having lived a pampered life. They also ignore the advice of John Thorton and other expert explorers, the former warning them about the thinning ice at a river. When Buck doesn't rise, Hal starts beating him only to be punched in return by Thorton as the latter takes Buck under his care, and the greenhorns and what remains of the original team by Perrault and Francois drown in the river.

'''John Thorton''': John Thorton is Buck's final master, a man exploring the Yukon for gold. He rescues Buck when the latter is being savagely beaten by Hal (threatening to kill him if he struck Buck again) and nurses the dog back to health. Buck and Thorton display a strange way of affection: Buck would bite his hand, and Thorton would lavish him with curses and insults in a loving way. He also places good faith in Buck, believing that he could pull a thousand pounds on a sled over a hundred yards (which he does and is praised for).

'''John Thorton''': John Thorton is Buck's final master, a man exploring the Yukon for gold. He rescues Buck when the latter is being savagely beaten by Hal (threatening to kill him if he struck Buck again) and nurses the dog back to health. Buck and Thorton display a strange way of affection: Buck would bite his hand, and Thorton would lavish him with curses and insults in a loving way. He also places good faith in Buck, believing that he could pull a thousand pounds on a sled over a hundred yards (which he does and is praised for). The 2020 film has Thorton played by Harrison Ford of ''Star Wars'' fame, as well as a backstory of having moved to the Yukon after he and his wife split up following the death of their son.

'''The Yeehats''': The Yeehats are a fictional Native American tribe known for their violent ways. Near the end of the novel, they kill John Thorton and his companions (as well as his two dogs), but they end up getting massacred left and right by an extremely vengeful Buck.

'''The Yeehats''': The Yeehats are a fictional Native American tribe known for their violent ways. Near the end of the novel, they kill John Thorton and his companions (as well as his two dogs, Skeet and Nig), but they end up getting massacred left and right by an extremely vengeful Buck.

==Film adaptations==

==Film adaptations==