The striker left the Baggies for the KC Stadium in January and has gone on to score three goals in 11 games for his new employers.
Dawson believes that West Brom will need to be fully focused on Saturday if they are to subdue the Ireland international.
"We've just got to be focused and alert all game because he's always alive," he told the club's official website.
"He's a great player and a great lad as well, it'll be a tough task for us to keep control of him but I'm sure we'll know all of his runs and his movements as well so it'll be a good test."
West Brom are currently in 16th place in the Premier League table, three points above the relegation zone.