Buck did not trust his animal instincts because his mind was telling him not to go but he didnt trust it and he went anyway.He didn’t listen that’s why he died.If Buck would have trusted his animal instincts then he probably wouldn’t have died.
Bucks instincts told him it was not a good idea to travel.But Buck still left the fire to travel.Buck was also told by someone to not leave the fire but he still did.
In conclusion,Buck did not listen to someone telling him not to go and he didn’t listen to his animal instincts to not leave the fire,that’s why