2009-10: Jake Dotchin skated for the Cambridge Hawks minor midget AAA team. In 30 regular season games he scored 8 goals with 19 assists and had 60 penalty minutes. In the playoffs he had 4 goals with 6 assists and had 26 penalty minutes in 11 games. Dotchin was selected by Owen Sound in the fourth round (70th overall) of the 2010 OHL Priority Selection.
2010-11: Dotchin played for the Cambridge Winter Hawks in the Greater Ontario Junior A Hockey League. In 41 games he scored 5 goals with 10 assists and had 88 penalty minutes. Cambridge finished eighth in the Midwestern Conference. In the five-game, first-round playoff series with Elmira, Dotchin scored 1 goal with 3 assists and had 8 penalty minutes.
2011-12: Dotchin appeared in 64 games for Owen Sound in his first OHL season. He scored 3 goals with 16 assists and was minus-two with 77 penalty minutes. Owen Sound was third in the Midwest Division and faced Kitchener in the first round of the playoffs. In five playoff games Dotchin had 3 assists and was plus-two with 8 penalty minutes. Dotchin slipped from 88th in Central Scouting's mid-term rankings to 139th in the final rankings prior to the 2012 NHL Draft and was selected by Tampa Bay in the sixth round (161st overall).
2012-13: Dotchin began the season with Owen Sound before a mid-season trade to Barrie in his second OHL season. In 66 regular season games between the two teams he scored 4 goals with 18 assists and was an even plus/minus with 81 penalty minutes. Barrie finished first in the Central Division and reached the OHL Finals against London. Dotchin scored 1 goal with 4 assists and was +5 with 25 penalty minutes in 17 playoff games.