Career
Dum signed a three-year professional contract with Bayer 04 Leverkusen in January 2005. He then left for Alemannia Aachen on an 18-month loan in January 2006. On the last match day of the 2006-2007 season, Leverkusen announced that Dum would be part of the new season squad.
On 26 August 2009, he left Leverkusen as he was loaned to Football Club Energie Cottbus for the season.
After that, he signed with Fortuna Düsseldorf and MSV Duisburg. On 24 August 2015 he signed with Schalke 04 World War II