Its nose was to the trail, and it trotted with a peculiar, sliding, effortless gait.

When they halted, it halted, throwing up its head and regarding them steadily with nostrils that twitched as it caught and studied the scent of them.
"It's the she-wolf," Bill answered.
The dogs had lain down in the snow, and he walked past them to join his partner in the sled.

Together they watched the strange animal that had pursued them for days and that had already accomplished the destruction of half their dog-team.
After a searching scrutiny, the animal trotted forward a few steps.

This it repeated several times, till it was a short hundred yards away.

It paused, head up, close by a clump of spruce trees, and with sight and scent studied the outfit of the watching men.