Several times those wheels stopped, and he heard voices outside.

At last he was sure that he heard a familiar voice, and he strained at his chain and whined.

The closed door slid back.

A man with a lantern climbed in, followed by his master.
He paid no attention to them, but glared out through the opening into the gloom of night.

He almost broke loose when he leaped down upon the white snow, but when he saw no one there, he stood rigid, sniffing the air.