Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Untested Hyena Sample

NPC	Level	Zone	Chance
Starving Blisterpaw	41 - 42	Tanaris	100%
Blisterpaw Hyena	44 - 45	Tanaris	100%
Rabid Blisterpaw	47 - 48	Tanaris	100%
Murderous Blisterpaw Rare	43	Tanaris	100%