A soliloquy is when <em>one person speaks their own thoughts out loud when he/she is by herself</em>.
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Answer: It is a part of the rising action that shows a conflict between the dogs.
Explanation: Usually in a pack of dogs, there will be a fight for dominance. Spitz intruded Buck’s nest to show him that he was top dog, which would have been seen as a challenge to Buck, and it shows a battle will follow soon.