Although he has not thrown an MLB pitch in 2020, Mike Dunn threw 8,237 pitches that were tracked by the PITCHf/x system between 2009 and 2019, including pitches thrown in the MLB Regular Season, the MLB Postseason, Spring Training and Fall/Winter Ball. In 2019, he relied primarily on his Fourseam Fastball (92mph) and Slider (86mph), also mixing in a Curve (75mph). He also rarely threw a Sinker (92mph).
Basic description of 2019 pitches compared to other LHP:
His fourseam fastball is straight as an arrow and has essentially average velo. His slider has short glove-side cut, is much harder than usual and has less than expected depth. His curve generates an extremely high number of swings & misses compared to other pitchers' curves, is an extreme flyball pitch compared to other pitchers' curves, has a sharp downward bite and has slight glove-side movement. His sinker (take this with a grain of salt because he's only thrown 7 of them in 2019) is basically never swung at and missed compared to other pitchers' sinkers, is an extreme flyball pitch compared to other pitchers' sinkers, has surprisingly little armside run and has slightly above average velo.