Dumbarton turned in a fine second-half performance to come away with the points at Ochilview.
Roddy Hunter took advantage of some poor defending to place the ball into the bottom corner on 49 minutes.
Hunter then saw his powerful header saved by Chris McCluskey, only for Scott Chaplain to tuck in the rebound.
A Ross O'Donoghue header made it three in the final minute of the game as the visitors cemented their place in mid-table of the Second Division.
Stenhousemuir: McCluskey, Iain Thomson, Stephen Thomson, Thom, Smith, McLeod, Love (Stirling 79), Scullion (Bradley 70), Dalziel, Molloy, Motion. Subs Not Used: Bennett, Brand, Lyle.
Booked: Dalziel.
Dumbarton: Vojacek, O'Donoghue, Smith, Dunlop, Gordon, McStay, Chisholm, Chaplain (Clark 89), Hunter, Craig (Carcary 76), Murray. Subs Not Used: White, Brannan, McNiff.
Booked: Chisholm, McStay.
Goals: Hunter 49, Chaplain 64, O'Donoghue 89.
Att: 568
Ref: J McKendrick
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