It was the wild in him that made him do this, and Gray Wolf ate ravenously.

Then he knew that each night hereafter he must hunt for Gray Wolf--and the little whimpering creatures hidden between the two rocks.
The next day, and still the next, he did not go to the cabin, though he heard the voices of both the man and the woman calling him.

On the fifth he went down, and Joan and the baby were so glad that the woman hugged him, and the baby kicked and laughed and screamed at him, while the man stood by cautiously, watching their demonstrations with a gleam of disapprobation in his eyes.
"I'm afraid of him," he told Joan for the hundredth time.

"That's the wolf-gleam in his eyes.

He's of a treacherous breed.