houndfish \hound"fish\, n. zool.
   any small shark of the genus galeus or mustelus, of which
   there are several species, as the smooth houndfish galeus
   canis, of europe and america; -- called also houndshark,
   and dogfish.
   1913 webster

   note: the european nursehound, or small-spotted dogfish, is
         scyllium canicula; the rough houndfish, or
         large-spotted dogfish, is scyllium catulus. the name
         has also sometimes been applied to the bluefish
         pomatomus saltatrix, and to the silver gar.
         1913 webster
see also:
galeus mustelus galeus canis houndshark dogfish scyllium canicula 
scyllium catulus pomatomus saltatrix