Northern "big cat"

I really should mention that I saw some kind of big cat along the highway to Yellow Knife, north of the Mackenzie River ferry crossing. It is not a great photo but I just looked at the creature in awe and never realized until he turned around and walk away that I probably should take a photo. The funny thing was that he managed to convey the sense that he was walking away relaxed and very slowly all while he really was moving quite fast.
This is the only photo I have so here it it.