2010-11: Vincent Dunn skated for the Gatineau L'Intrepide in Quebec AAA midget hockey. He was the team's second-leading scorer as a 15-year-old and led Gatineau with 122 penalty minutes. He scored 22 goals with 26 assists in 41 games. L'Intrepide finished fourth in the CCM Division. Dunn scored 1 goal with 8 assists and had 2 penalty minutes in four playoff games. He was selected by Val-d'Or in the first round (16th overall) of the 2011 QMJHL Entry Draft.
2011-12: Dunn played in 56 of 68 games for Val-d'Or in his first QMJHL season. He scored 5 goals with 8 assists and was -12 with 94 penalty minutes (third most for the Foreurs) . Val'd'Or reached the playoffs and finished second in the West Division despite a sub-.500 record. Dunn played in three of four playoff games in the first round series with Rimouski; scoring 1 goal with 5 penalty minutes.
2012-13: Dunn provided both scoring and toughness for Val'd-Or in his second season. He was the Foreurs' fourth-leading scorer with 25 goals and 27 assists in 53 games, missing most of January, and shared the top plus/minus for the Foreurs (+21) with Anthony Mantha. Dunn's 98 penalty minutes were third-most on the team. Val-d'Or finished fourth in the West with 35 wins (the most since 2006-07) and reached the second round in the playoffs. Dunn had 3 assists and was -1 with 19 penalty minutes in 10 playoff games. In June, he was obtained by his hometown Gatineau Olympiques in a QMJHL draft day trade. Dunn was ranked 73rd amongst North American skaters in Central Scouting's final rankings prior to the 2013 NHL Draft.
A pest on the ice, Dunn makes his mark by getting under the skin of his opponents. Only average sized, that doesn't stop him from finishing his checks and battling hard against the wall. Perhaps even more frustrating for the opposition is that he has some ability to hurt them on the score sheet, as well. Though his offensive stats come more from his hard-nosed play rather than dynamic scoring talent, it doesn't matter how pretty a goal is on the scoreboard.