how did the author communicated in the call of the wid

This is written in third person limited omniscient. London has a style of writing that followed the idea of naturalism. His landscapes are grand and humans are not the paragon of animals. London uses his own style of “anthropomorphism” or the description of an animal with human-like qualities and traits. Consider phrases like “…Buck possessed a quality that made for greatness—imagination.” Certainly animals do not overtly think like this but London gives enough human perspective for the reader to relate to Buck without having the animals speak. London keeps his dogs within the context of naturalism without destroying their authenticity (like say a Disney cartoon with animals speaking).