Lewis Grabban's sixth goal in as many matches was enough to settle a subdued contest in Bournemouth's favour.
Dunne said: "Overall I thought our game plan was spot-on. I wanted us to be harder to beat.
"We've been letting goals in all over the place, but one lapse in concentration has cost us. Our goalkeeper has made some good saves in the match, but he might have saved that.
"We were on the front foot in the second half and overall, I thought we merited a draw."