Dunn became the first Bison player to score four touchdowns since DJ McNorton's effort at Montana State in 2010 in the second round of the FCS playoffs.
Dunn did all his damage in the first half on three carries for 111 yards and three touchdowns and caught a 10-yarder for a score. He scored on runs of 61, 5 and 45 yards.
North Dakota State (3-0) scored five touchdowns in the first quarter and led 49-0 at halftime. The Bison piled up 450 yards of total offense to 57 for Robert Morris (2-2).
The Bison were 10 of 17 on third down conversions with Robert Morris going 0 for 9. The Bison held the ball for just more than 39 minutes.
Cole Blake had 50 yards rushing for Robert Morris.
More AP college football: http://collegefootball.ap.org and http://www.twitter.com/AP-Top25
Brady White threw for 269 yards and five touchdowns, Darrell Henderson had a career-high 233 yards rushing and two scores, and Memphis beat Georgia State 59-22 on Friday night.
SEC Now's Chris Doering and Gene Chizik make their picks for Saturday's matchup between the Rebels and Crimson Tide.
Kenny Gainwell scores a 72-yard touchdown, putting the team over 400 rushing yards for the game and giving Memphis a 59-16 lead.
Former Memphis basketball player Anfernee Hardaway discusses his new role as the Tigers' head basketball coach.
SEC Now's Gene Chizik gives his bold prediction for Florida as it enters its matchup against Colorado State.
Memphis RB Darrell Henderson breaks free for a 65-yard touchdown, putting him over 200-rushing yards on the night.
|St Francis (PA)||0-0||1-2|
|North Dakota State||0-0||2-0|
|South Dakota State||0-0||2-0|