Dunn must be sick of the sight of the Eyemouth striker. It was just over a year ago that Shennan scored a hat-trick in a similar 5-1 win for Eyemouth over Coldstream at Warner Park.
Dunn was sacked by Coldstream after that match in August last year, and he took over at Albert Park a few months later.
Eyemouth lost half their squad in the summer, but Shennan’s remarkable scoring form has helped Carl Hudson’s men start with a 100 per cent record in the league so far.
Despite a first-half in which the Albert were largely in the ascendency, a 20th minute clanger from goalkeeper Matt Liddle sent Hawick into a tailspin from which they never recovered.
Things had started brightly for the home side, with Eyemouth goalkeeper Adam Mutch forced into two good saves.
But Eyemouth took the lead after 20 minutes when Nicky Clark tried his luck with a free-kick which ought to have been routine, but when Liddle fumbled the ball Connor Lough was on hand to bundle home the rebound.
Lough missed a chance to double the lead, but five minutes into the second half, Hawick were back on level terms, Keenan rushing onto an excellent diagonal pass to find the net.
Eyemouth were back in front in the 56th minute, Shennan smashing one into the top corner from the edge of the penalty box.
The Eyemouth went on to extend their lead ten minutes later, a static defence appealing for offside as Shennan burst through to fire past Liddle.
Worse was to come for the Albert two minutes later, as Eyemouth substitute James Wilson got on the scoresheet, blasting home from close range after picking up a low cross from the left.
Danny May blazed a Noble cross over a moment later, but the 80th minute saw the Fishermen extend their lead even further, Shennan completing his hat-trick with a simple tap-in from another low cross.
Shennan had another goal disallowed in injury time for a reckless challenge on Liddle immediately beforehand, but the real talking point of was yet to come, with Albert manager Dunn’s shock departure from the club shortly after the game’s conclusion.