Douglas, who was one of an unusually high number of early commitments, gave his verbal pledge on June 11. On Wednesday he made it official by when he signed and faxed his scholarship papers to Auburn.
Douglas runs the football as a senior. He is expected to immediately challenge for playing time.
At 6-2, 235 pounds Douglas is a two-star prospect but has been the perfect style of lead blocker in recent years in a run-oriented offense according to Aquinas head coach James Connor.
The big fullback was one of 17 recruits who took their official visits to Auburn on Jan. 12 and has already built a strong friendship with many other Tiger commitments like tight end Bailey Woods and offensive tackle Lee Ziemba.
Douglas is one of nine children and is the oldest boy in the family.
Film of Douglas: