Before he was playing for the Woodville-West Torrens Football Club, Dunstan played for South Clare Sports Club in the North Eastern Football League in the Mid North.

[1] Dunstan became an integral part of St Kilda's midfield over the course of 2014 before bowing out after round 19 for shoulder surgery.

Dunstan turned his back on a potential move home to South Australia after playing an important role in the Saints' climb to ninth in 2016.

[3] In 2017, Dunstan signed a two-year contract extension with St Kilda to remain at the club until the end of 2019.

[4] At the conclusion of the 2021 AFL season, Dunstan moved to Melbourne as an unrestricted free agent.