It was the barking of dogs.
For two minutes Thor sat on his haunches without moving a muscle of his great body except those twitching thews in his nose.
Deep down in this cup under the mountain it was difficult even for sound to reach him.

Quickly he swung down on all fours and made for the green slope to the southward, at the top of which the band of sheep had slept during the preceding night.

Muskwa hurried after.
A hundred yards up the slope Thor stopped and turned.

Again he reared himself.

Now Muskwa also faced to the north.