The midfielder struggled with injury during his time at Birmingham and had no hesitation in rejoining Rovers in the January transfer window.
Since then he has been building up not only his fitness but his confidence after a difficult time in the midlands.
Dunn played a neat one-two with Matt Derbyshire and then saw goalkeeper Jens Lehmann spill his effort into the net.
Hughes said: "The lads poked fun at him and told him it was an own goal. But he wasn't having it.
"We are delighted for Dunny - I thought he was excellent. His general play was good as was his determination to have a positive effect on the match.
"He is looking stronger every game he plays and is becoming a bigger influence. He is getting to the levels we knew he could."