At the conclusion of his entry-level deal, in July 2013, Dumont was re-signed by the Canadiens to a two-year, two-way contract.[5] This was followed by an additional one-year, two-way contract extension on June 1, 2015.[6]
After seven seasons within the Canadiens organization, Dumont left as a free agent to sign a one-year, two-way contract with the Tampa Bay Lightning on July 1, 2016.[7]
On June 28, 2017, the Lightning announced that they had re-signed Dumont to a two-year, $1.3 million contract extension.[8] Dumont made the Lightning's roster to open the 2017–18 season. He would appear in seven games being held pointless before being placed on waivers by the Lightning and claimed by the Ottawa Senators on November 22, 2017.[9] On February 20, 2018, Dumont was placed on waivers by the Senators,[10] and was then claimed by the Lightning the next day.[11]
On July 1, 2019, Dumont signed as a free agent to a two-year, two-way contract with the Minnesota Wild.[12]
At the conclusion of his contract with the Wild, Dumont would return to his former club, the Tampa Bay Lightning, in agreeing to a one-year, two-way contract on July 28, 2021.[13]
On June 9, 2022, Dumont signed a two-year contract with the Syracuse Crunch of the American Hockey League (AHL) to remain within the Lightning organization.[14] This was followed by a one-year extension with the team in June 2024.[15]