Bunbury moved inside the top five and handed Collie their first defeat of the season after a comfortable 37-point victory over the Eagles on Sunday.
The Bulldogs trailed after a soggy first quarter at the Collie Recreation Ground but a run of eight unanswered majors either side of half-time broke the game open.
Athletic forward Jordan Adamson-Holmes booted five goals in the 13.9 (87) to 5.9 (39) triumph which lifted Bunbury into fifth position on the ladder.
Carey Park took the four points at Kelly Park but only after an entertaining battle with a rebuilding Augusta-Margaret River.
The Hawks finally went down by 20 points after having led by a point at quarter time, being all square at half time and leading by five points at the final change.
In Harvey, a best-on-ground performance from on-baller Alex James led the Bulls to a 38-point victory over Donnybrook.
On Saturday night, Busselton bounced back to winning form at Brunswick Oval.
A seven-goal-to-three opening term set up their 24-point win over a spirited Harvey-Brunswick-Leschenault.
At Hands Oval, Eaton cemented their position on top of the ladder with a 99-point triumph over South Bunbury, to be the only undefeated team after four rounds.
FULL REPORTS AND SCOREBOARDS IN TUESDAY'S BUNBURY HERALD