There's a bunch of theories about the demon wolf. Whether it's a genetic mutant, an unknown species, a Lazarus Species... Unfortunately, while there is a taxidermy specimen, it couldn't be DNA-tested because there were two institutes battling over ownership of it. Though that information may be a little out of date since it's from the 00's. Stories of wolves like that in the area go back to pre-colonial times though.
Oh! I think I do know of it. The name most people know it as is the Shunka Warak’in.