How we cite our quotes: (Chapter.Paragraph) Shmoop has numbered the chapters continuously, but the book renumbers them in each Part.
Quote #4
In reality it took away from him all honour, and instead of being bully and master of the pack, he now found himself hated and persecuted by the pack. (13.5)
Sometimes, when you win, you lose. If you beat up all the other members of the pack, you become the pack leader. That's victory by competition, right? The only problem is, when you become the leader of the pack, you have to sit at the front of the sled team, being chased by the dogs you've already beaten up. Yeah, maybe you should have thought that one through.
Quote #5
Not for nothing had he been exposed to the pitiless struggles for life in the day of his cubhood, when his mother and he, alone and unaided, held their own and survived in the ferocious environment of the Wild. (13.24)
It sounds like London is pointing out the good side of competition. Fighting for his life every day makes White Fang a tough little bugger.
Quote #6
To be compelled to run away before the yelling pack, every dog of which, for three years, he had thrashed and mastered, was almost more than he could endure. But endure it he must, or perish, and the life that was in him had no desire to perish out. (15.2)
In this passage, the competition changes a little bit. He's not fighting against other dogs here. Well, okay, he's fighting against other dogs (who are chasing him and trying to kill him). But on a larger sense, he's competing against death, which is what all the other competitions in the story basically boil down to.