One of the most legendary and recognizable monsters in World of Warcraft is the Core Hound, a Cerberus-like dog with multiple heads and a body made of pure, molten lava.
WoW Guide – Core Dog Pets – Hunters
These dogs were the official pet of Firelord Ragnaros and were plentiful in WoW's first raid, Molten Core. Today, you can return to the Molten Core and tame a Core Hound for yourself if you're playing as a Hunter. The only requirement for getting a Core Hound for your Hunter in WoW is to be specially trained in the Beast Mastery specialization, which gives access to exotic pets.
Additionally, there are a number of alternative Core Hound colors that you can add to your stable if the pet's original orange color does not suit your needs.
Here you will find all the Core Hounds in WoW and where to tame them.