Cape Town - West Brom heaped more misery on a struggling Bournemouth side with their 2-1 Premier League win at The Hawthorns on Saturday.
There was little in the way of goal-mouth action before referee Mark Clattenburg pointed to the spot as Allan Nyom upended Ryan Fraser in the box.
King stepped up and sent Ben Foster the wrong way to give the visitors a very early lead.
Chris Brunt hit the side netting as West Brom responded, but Foster was soon back in the action, as he tipped a powerful Adam Smith effort over his goal.
But it didn't take long for the hosts to draw level, with Dawson picking up a ball from Nacer Chadli before firing in a shot from 25 yards, via a deflection off Charlie Daniels.
James Morrison saw his 20th minute shot deflected wide before McAuley put his side in the lead for the first time in this game following a failed punched clearance from Cherries stopper Artur Boruc, leaving the goalscorer to tap home from close range.
Steve Cook fired over before Marc Pugh hit the side netting as Bournemouth looked to end the half strongly, while McAuley got a vital touch ahead of Wilshere from a Fraser cross for the last real action of the first 45 minutes.
West Brom had the ball in the back of the net on 51 minutes, but it was ruled out as Chadli was offside when he headed home after McAuley's header that hit the crossbar, fell to Brunt, whose cross was headed goalwards by Dawson and latched onto by the former Tottenham man.
Arter's 25-yards, low shot just past the hour mark skimmed just past the Baggies' goal, and while Bournemouth battled to get back into this tie, the hosts managed the remainder of the game well.
Salomon Rondon raced, unsuccessfully, to get on the end of a McClean ball across the face of the Cherries' goal while McClean forced Boruc into a good save with his feet in stoppage-time.
But it was Bournemouth substitute Lys Mousset who enjoyed the last real chance of the game, with a powerful shot that Foster tipped over the bar.