Three second-half goals earned Cove Rangers the points at the Marbill Coaches Stadium this afternoon.
Sons were well on top in the first-half but came up against an inspired Balint Damus in the visiting goal.
He denied James Hilton on more than one occasion, whilst he also kept out Matty Shiels with a stunning one handed save, Hilton hit the post and Kalvin Orsi had an effort cleared off the line.
It was a different story after the break with the visitors getting the opener when a cross from the right bounced through Brett Long and into the net.
Mitch Megginson added a second with a curling effort and the points were sealed when Adam Emslie pounced.
Dumbarton travel to Kelty Hearts next weekend.