2010-11: Dylan Sadowy skated for the Vaughan Kings bantam AAA team in Ontario. The Kings captured the championship of the Bauer International Invite tournament in Chicago.
2011-12: Sadowy played for the Vaughan Kings minor midget AAA team. In 53 games he scored 33 goals with 45 assists. The Kings played in the 2012 OHL Cup and in five games Sadowy scored 1 goal with 3 assists and 8 penalty minutes. Sadowy was selected by Saginaw in the second round (37th overall) of the 2012 OHL Priority Draft.
2012-13: Sadowy made his OHL debut with Saginaw as a 16-year-old — skating in 61 of 68 regular season games for the Spirit. He scored 2 goals with 6 assists and was -13 with 45 penalty minutes. Saginaw finished fourth in the West Division. Sadowy played in three of four games in the Spirit’s first round playoff series with Memorial Cup-bound London and was -1 with 1 assist and 7 penalty minutes.
2013-14: Sadowy led Saginaw with 27 goals and had 9 assists — finishing +14 with 69 penalty minutes — in 68 regular season games in his second OHL season. Saginaw finished third in the West Division. Sadowy was ranked 89th amongst North American skaters in Central Scouting’s mid-term rankings prior to the 2014 NHL Draft.