How is Buck exhibiting the principle of "civil disobedience" in The Call of the Wild?

The definition of civil disobedience will be critical
here.  If the definition of civil disobedience is seen as an outward rejection or
repudiation of social practices that one sees as wrong, then Buck's refusal to follow
human social practices after Thornton's death could be seen as civil disobedience.  Buck
refuses to follow the human society's rules and refuses to be a party to it once the
Yeehat Indians kill Thornton.  It is here where Buck recognizes that he has reached a
point in his own consciousness where action must be taken.  He has experienced human
cruelty in his abduction, treatment with different owners, and his own experience with
the brutality of human beings caused him to have doubt.  Thornton might have represented
the last bonds of loyalty to humans, but once he was killed, it seemed to signal a sort
of break in Buck's own mind.  This separation became Buck's own embrace of civil
disobedience, stressing that individuals must  take action against that which is seen as
unfair or unjust:  "Civil disobedience is the active, professed refusal to obey certain
laws, demands, and commands of a government, or of an occupying international power."
Buck is not resisting an international order as much as he is rejecting the actions of
humans and his "call to the wild" is his own ability to take action to bring attention
to this predicament.