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The domesticated generations fell from him. In vague ways he remembered back to the youth of the breed, to the time the wild dogs ranged in packs through the primeval forest, and killed their meat as they ran it down. It was no task for him to learn to fight with cut and slash and the quick wolf snap. In this manner had fought forgotten ancestors.

From Jiskha Homework Help:

2. On page 14 of The Call of the Wild, what's meant by the phrase "The domesticated generations fell from him"?
A. Buck has lost a lot of hair in his fight with Spitz.
B. Buck is learning to love a human being again.
C. Buck is losing his civilized characteristics.
D. Buck longs to return home to the Judge's family.

The answer is clear once you have looked up "domesticated" in an online dictionary.