Sam Dower added 18 points for the Bulldogs (18-3, 8-1 WCC), who have won four straight games and eight of their last nine.
David Stockton put in 14 points and distributed seven assists. Gary Bell scored 14 for Gonzaga.
Tyler Haws posted 23 points for the Cougars (13-9, 5-4), who were coming off a triple-overtime loss to Portland Thursday.
Kyle Collinsworth had 13 points and seven rebounds.