One of his early short films, titled Life Doesn't Frighten Me, starred Canadian actor Gordon Pinsent and won various awards, including the CBC Short Film Face-Off, with a cash prize of $30,000.

[2] He was also named the inaugural winner of the Len Blum Residency, a Toronto International Film Festival program for emerging directors.

[9] Dunn directed and produced the web series Pop-Up Porno, which streams on YouTube and premiered at the Sundance Film Festival.

[10][11] He also directed "The Son", a 2020 episode of the Apple TV+ series Little America focusing on a gay immigrant from Syria,[12] and has been writing a planned reboot of Queer as Folk.

[13] In 2022, Dunn told the public that the new location for Queer as Folk (2022 TV series) is set in New Orleans because he wanted to give a contribute to his close drag queen superstar friend Chi Chi DeVayne, who is deceased.