A dog's corpse is shown held in the arms of its dead owner. One of the sled dogs, Digger is killed off-screen by wolves. White Fang's mother dies after returning to their den with a gunshot wound. It's implied that some of the dogs White Fang was forced to fight died from their injuries.
White Fang's mother is shot and later dies. White Fang and multiple dogs are abused by humans and forced to fight to death in a pit. When White Fang refuses to fight, Beauty Smith beats him with a cane.
Digger the sled dog briefly fights White Fang's mother before being chased down by the wolf pack and killed off-screen. Multiple dogs and White Fang are forced to fight each other, often to death. Dog fighting is a major plot point midway through the film so there are many scenes of dogs fighting each other.
A mother wolf feeds a rabbit leg and a fish head to her pup. A dog's corpse is shown held in the arms of its dead owner. A dead rabbit is shown as bait in a trap.
Not in a negative way. Jack chases off White Fang so he can live free in the wild, but he has to act threatening so it's a sad scene. They happily reunite at the end.
As a pup, White Fang snuggles with his dead mother and howls when he realizes he's alone. Multiple dogs whine and seem sad when they're defeated in fights. White Fang is also confused and whines when Jack forces him to return to the wild.
A rabbit is hunted by wolves. You don't see it die, but you see the wolves' eyes as they eat. Later you see a wolf carrying a rabbit leg into her den. This all happens in the opening scene, after the credits. Later, a dead rabbit is shown as bait in a trap.