*laughs* pretty good, actually, especially building off sablemoonsilk's answer. But wolves are pretty much by definition not curs or mongrels, which are mixed breeds.
And the "basilisk cur" part does have to do with HP. But it's not the only part of dark mongrel that is important. In addition, the basilisk cur is not always a mongrel, and, Shannon, he has more to do with darkness than just nighttime.