A Felhound Tracker is summoned by players using a 
[Fel Orb]. They are used in order to track down Azsharite for the quest 
[58G] Azshariteω τ ϖ.
It is speculated that Loramus Thalipedes' felhounds (Raytaf, Shahiar, and Zaman) are tracking hounds too.
For more information on how to control the Felhound Tracker, please refer to your Fel Tracker Owner's Manual.