From 2012 to 2015, he spent time with the Oshawa Generals of the Ontario Hockey League (OHL) and helped win the J. Ross Robertson Cup in 2015.

[2] Petschenig signed his first professional contract on May 19, 2016, putting pen to paper on a two-year deal with Genève-Servette HC of the Swiss top-flight National League A (NLA).

[2] On August 26, 2019, Petschenig signed his first professional contract in North America, agreeing to a deal with the Fort Wayne Komets of the ECHL for the 2019–20 season.

[7] He registered 2 assists in 26 games before he was claimed off waivers by the Kalamazoo Wings on March 10, 2020, before the season was cancelled due to COVID-19.

[11] Petschenig had created the programme "A Heart Like Mine" for kids who have lost a parent in memory of his father Dan, a former football player for the Toronto Argonauts[12] who died in 2013.