Falcons running back Warrick Dunn returned to practice Monday, three weeks after undergoing back surgery that has kept him out of training camp. Dunn practiced with the second team, participating in all drills. Dunn had surgery on July 21 for a herinated disc in his back. At the time of the surgery, the Falcons announced Dunn was expected to miss three to four weeks and be ready for the start of the regular season.