Spike is a neutral level 5 darkhound critter, being chased by Underfoot around the Blacksmith in Arathi Basin. Spike and Underfoot appear only when the Blacksmith is claimed by the Horde for the Defilers.
The Alliance counterpart of Spike is Cleo who is chased by Lady when the League of Arathor controls the Blacksmith.
Patches and hotfixes
Patch 1.7.0 (2005-09-13): Added