Interim coach Clay Helton announced the prognosis for both players Saturday night.
Smith leads the Trojans with 78 tackles as a freshman, making three interceptions and growing into a starring role. He was injured in the second quarter in Boulder, limping off the field with a torn ligament in his knee.
Dawson has a shoulder injury, Helton says. The senior has 31 tackles in eight games, ending his up-and-down career with another major injury after missing half of the 2013 season and all of 2014 with a knee injury.