A dog named Buck starts his journey at his home, with many other animals and a good life. He is the king of his home and his owner is the judge.
A gardners helper took Buck on a walk to a park and sold him to a stranger. Buck was choked till he passed out and was put in a baggage car.
Law of Fang
After days of travel, Buck found himself being let out of a crate in a room with many men standing around. He attacked the man in the red sweater and learned that the one with the club is to be obeyed.
After Buck is bought, he is brought north and sees snow for the first time. He licks at it and plays in it. The people who see Buck playing in the snow laugh at him and he doesn't understand why.
A dog named Curly that Buck came north with decided to be social with the other dogs and gets attacked. Curly dies from her mistake and Buck learns the law of fang from seeing this experience.
Shortly after the death of his companion, Buck is harnessed to a sled for the first time. He is trained how to run with the sled by two other dogs in the back of the line.