2009-10: Jacob Doty made his WHL debut as a 16-year-old, skating in five early season games with the Seattle Thunderbirds, before joining the Wyoming-based Yellowstone Quake of the Northern Pacific Hockey League. He had no points and was an even plus/minus with 11 penalty minutes with the Thunderbirds. Doty scored 20 goals with 23 assists and 142 penalty minutes in 39 regular season games for the Quake and scored 3 goals with 4 assists and 29 penalty minutes in eight NPHL playoff games.
2010-11: Doty played in 70 of 72 games for Seattle, primarily as an enforcer and energy line player, in his first WHL season with the Thunderbirds. Doty scored 4 goals with 3 assists and was -3 for Seattle. Doty led the Thunderbirds and was 10th in the WHL with 176 penalty minutes. Seattle missed the WHL playoffs; finishing last in the U.S. Division.
2011-12: Doty attended the Florida Panthers prospect camp before returning to Seattle for his second season. He skated in 55 of 72 games for the Thunderbirds. Doty scored 2 goals with 5 assists and was -10 with 107 penalty minutes. Seattle had the WHL's third-worst record, finishing last in the U.S. Division, and again missed the playoffs.
2012-13: Acquired in May by Medicine Hat in exchange for forward Riley Sheen, Doty displayed some offensive play to go along with his toughness in his first season with the Tigers. He scored 11 goals with 17 assists and was -9 with 90 penalty minutes; skating in all 72 regular season games. Medicine Hat finished fourth in the Central Division and reached the second round in the playoffs. Doty had 1 assist and was -5 with 11 penalty minutes in eight playoff games.
2013-14: Doty was invited to the St. Louis Blues' training camp and signed to a three-year entry-level contract by the team in September. He spent time with the AHL's Chicago Wolves in the pre-season before returning to the WHL to skate in an overage season with Medicine Hat. Doty scored 10 goals with 13 assists and was an even plus/minus with 83 penalty minutes in 68 games for the Tigers. Medicine Hat finished third in the Central Division and reached the Eastern Conference finals against Edmonton. Doty scored 1 goal with 2 assists and was -8 with 26 penalty minutes in 17 playoff games.
After earning an invitation to training camp with the St. Louis Blues, Doty was signed to a three-year entry-level contract by the team in September, 2013. Doty will skate in the WHL with the Medicine Hat Tigers for the 2013-14 season.