I'm afraid what you saw was likely a shaman and not a hunter. There are no tameable versions of that wolf model unfortunately. Enhancement shamans can summon Doom Wolves with their artifact this expansion which come in a variety of elemental types (fire/lightning/frost I think?), and one of them is definitely the blue lightning wolf. These are the best images I could find to show off both the lightning and the fire type, what you saw as Hati was probably the second spirit wolf.
I don't blame you for making the mistake though, seeing a mail-wearing character with 2 pets at their side is certainly understandable!
(screenshots from some google searching, not mine)