After going undrafted in the 2000 NFL Draft, Neil was signed by the Atlanta Falcons. He played 6 games behind Dan Stryzinski at punter, and dealt with injury problems for some of the season. In 2001 he was released and then signed to the Falcons practice squad. He was then re-signed to the regular roster on January 10, 2002. However, in a pre-season game Neil injured his ankle and was placed on Injured Reserve on August 27, 2002. In 2003 Neil became a free agent before signing with the New York Jets. He was waived in early 2004, ending his NFL career.
Dallas Neil is the first and only NFL player to hold a master's degree while actively playing for the NFL.