Dumas was selected in the third round (97th overall) of the 1995 NFL draft by the Kansas City Chiefs.[2] He ended up missing his entire rookie season after injuring his knee in the second preseason game, against the Arizona Cardinals.[3] In 1996, he appeared in six games, at both linebacker and on special teams. In 1997, appeared mostly on special teams, it was during this season he recorded his only career sack. Midway through the season, he joined the St. Louis Rams, appearing in two games for them. On July 8, 1998, he was released by the Rams.[4] On January 5, 1999, he signed with the Denver Broncos.[4] However, he was released on August 26, 1999.[4]
In early 2008, he joined the coaching staff at Southeast Missouri State as the teams linebackers coach.[5][6] That same year, he also earned an NFL Minority Coaching Fellowship with the Kansas City Chiefs.[7]