1. Ended up, emerged as. You enter a contest and only one "comes out" as the winner.
2. I don't know what you mean. It's literal. His legs were cut off by a machine.
3. I don't know. Perhaps the betting on the dog fighting had to do with the duration a dog would last against another dog.
4. The dog. The dog must have liked to "win" fights by biting the other dog's back legs. Since this dog did not have any back legs (see #2 above, does that explain the context?), Smiley's dog did not know how to fight.
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