MeoMeo or was it RuffRuff:
The Gemarah talks (deals) with being megadal a Kelev Rah – one who barks (startles / freightens people) even without biting. Like RuffRuff>byte (or Ruff 2 byte)
However with a tame one, one can do various mitzvhos, feeding before eating, tzar baalai chaim, walking with a koser leash on shabbos.