The same torn knee ligament kept Dennis from participating in the entire 2005 season, having already used his redshirt year he lost a year of eligibility. Going into the 2006 season, Dennis was the leading career rusher among current student athletes. Unfortunately, in spring practice Dennis was again beset by season-ending knee injury, causing him to entirely miss a second year in a row. While this would have eliminated his final year of eligibility, Dennis and USC applied to the NCAA for a sixth year of eligibility, given the extreme circumstances. Dennis returned to full-contact practice in the 2007 spring practice In May 2007, Dennis graduated with his bachelor's degree in sociology. The NCAA granted his application for a sixth year of eligibility in June 2007.