"chief magistrate of the old republics of Venice and Genoa," 1540s, from Venetian dialect doge, from Latin ducem, accusative of dux "leader," from PIE root *deuk- "to lead." Related: Dogate; dogeship.
dog days
dog star
dog's meat
dogberry
dog-collar
doge
dog-ear
dogface
dogfight
dogfish
dogged