For, unlike the other dogs, he would not howl or whimper his pain.

A year old now, the last six months had gone far toward maturing him, and it was the nature of his breed to be fearless and stoical.

And, much as he had been taught by his white masters to hate and despise niggers, he learned in the course of these thirty hours an especially bitter and undying hatred.
His torturers stopped at nothing.

Even they brought wild-dog and set him upon Jerry.

But it was contrary to wild-dog's nature to attack an enemy that could not move, even if the enemy was Jerry who had so often bullied him and rolled him on the deck.