The correct answer is Buck’s love for Thornton. There is bet placed about Buck’s strength, stating that he will not be able to pull a thousand pound sled. The amount is huge: 1600 dollars. Buck is able to do it and win the large amount for John Thornton. Although as a dog he really does not even know what is going on, his instinct tells him that accomplishing this task will please Thornton and because he loves him that makes him happy. This increases their bonding and loyalty to each other.
1) When it comes to Shakespeare our truncated attention spans might make it difficult to understand the complex structure and language within his work.
2) A contemporary of Shakespeare's may have understood the language in his works because they lived at the same time as him.
3) Many readers like the phantasmagoric scenes in Shakespeare's plays because they are dreamlike or surreal.
4) We get a vicarious thrill out of reading fiction because it provides us with imagined interpretations.
Artifactual Communication is what your looking for.