The big front-rower linked up well with fellow prop Kade Snowden and raced under the posts to give Gidley the simple task of tapping over the conversion.
The Knights constantly tested Bulldogs dangerman Ben Barba with the high ball and although the young fullback coped well with the barrage, he was unable to have any influence going forward as the Knights smothered any of his attacking forays.
Jarrod Mullen extended his side's lead midway through the opening half, spotting a gap in the Bulldogs' defence before lunging underneath a Barba tackle to score, with Gidley adding the second of his four goals.
Gidley stretched the advantage early in the second period with a penalty and the Knights controlled the pace game, with veteran hooker Danny Buderus showing all his experience with a man-of-the-match performance.
An error count of 15 and a completion rate of 62 per cent was the story of the day for the Bulldogs, who simply ran out of ideas in the second half.
And it was no surprise when the Knights went over for a third try, with Alex McKinnon scoring his first for the club eight minutes from time.
Joel Romelo gave the home crowd of 20,701 something to cheer about with the last play of the game, with Steve Turner kicking the conversion.
-AAP