Mob: a hound of the shadow
Something dark stands here, too dark to make out what it actually is. It
walks in and out the shadows, and all you can see are a pair of blood-red
eyes that flicker in and out of view. But, every so often, you can hear a
deep growls, snarls and yelps, the sound of a hound of the shadow.
Should probably remove that "a" given the plural growls, snarls, and yelps