With the game tied and Utah with possession, Dotson and teammate Dominic Artis teamed up to tip a Utah pass ahead where Dotson corralled it and took in for the game-winning dunk.
The bucket and win give the Ducks their first 13-0 start since 2006-07, and start Oregon off with a win in Pac-12 play.
Dotson tied the game at 68 with 35 seconds to go in overtime with a sweet crossover dribble and reverse lay-in combination.
Considerable attention was given to each team's offense entering the night, as both ranked in the top five nationally in scoring and field goal shooting, but it was defense that gave the Oregon the edge.
Utah shot just 38-percent from the field, 16 percent below their season average, and gave up 11 Oregon steals, none bigger than the one that led to Dotson's game-winner.
Never was their defense better than when they climbed all the way back from the game's largest deficit at 45-35, to take a 53-49 lead. During that stretch, Utah was 1-for-8 from the field.
Utah scored just six points in the slug-out overtime period.
Dotson and the Oregon offense was held well below it's lofty shooting percentage and 20 points below its scoring average. The Utes shut down Oregon leading scorers Joseph Young and Mike Moser, who combined for just 12 points on 3-for-13 shooting.
Instead it was reserve guard Dominic Artis providing the spark off the bench, showing glimpses off what he provided early last year. New starting center Richard Amardi led the team with 14 points, but was just 5-for-13 from the field and Artis had 12 points. Dotson finished with 11.
Despite a major size disadvantage, the Ducks managed to out-rebound Utah 41-38, led by 12 rebounds from Moser and seven from Amardi.
Oregon will travel to Boulder to play Colorado Sunday at 2 p.m.