White Fang

From the text:

He was a fierce little cub. So were his brothers and sisters. It was to be expected. He was a carnivorous animal. He came of a breed of meat-killers and meat-eaters. His father and mother lived wholly upon meat. The milk he had sucked with his first flickering life, was milk transformed directly from meat, and now, at a month old, when his eyes had been open for but a week, he was beginning himself to eat meat—meat half-digested by the she-wolf and disgorged for the five growing cubs that already made too great demand upon her breast.