dog-fox

from The Collaborative International Dictionary of English v.0.48

Dog-fox \Dog"-fox`\, n. (Zool.)
      (a) A male fox. See the Note under {Dog}, n., 6. --Sir W.
          Scott.
      (b) The Arctic or blue fox; -- a name also applied to
          species of the genus {Cynalopex}.
          [1913 Webster]