In front of a season-best 17,444 crowd the Cowboys were given all they could handle early by the typically plucky Dragons, who seemed to drag the usually sparkling Cowboys' attack down to their level.
But after an extended feeling-out period it was Cowboys fullback Lachlan Coote (two try assists, two line-break assists) setting up the huge win with a second-half masterclass.
The Cowboys pressed early, forcing three repeat sets in the Dragons' red zone, but the defensive wall stood firm early on before the contest degenerated into a scoreless error fest.