Core hound mounts

Core hound mounts were first added to World of Warcraft with Warlords of Draenor.

Professions

 * Steelbound Devourer comes from Blacksmithing.

Promotion

 * Core Hound was awarded by the achievement Boldly, You Sought the Power of Ragnaros during WoW's 10th Anniversary.

Quest

 * Dark Iron Core Hound is a quest reward from Dark Iron Dwarves (quest).