Baker accepted an athletic scholarship to attend the University of Florida in Gainesville, Florida, and played for coach Ron Zook and coach Urban Meyer's Florida Gators football teams from 2003 to 2006. He originally signed to play for the Gators in February 2001 as a member of what would become coach Steve Spurrier's final recruiting class at Florida, but due to NCAA academic eligibility issues, Baker instead enrolled at Northfield Mount Hermon School, an elite preparatory school in Massachusetts, for one year. While at Mt. Hermon, Baker led his team to the New England Championship game. After Spurrier left Florida for the NFL and Zook was hired to replace him, Baker stuck with Florida and enrolled as a partial-qualifier in 2002. Urban Meyer's hiring at Florida three seasons later marked a turning point in Baker's career at Florida. In 2005, he made fifty-six receptions, doubling his total from the previous season. Afterward, Baker's college grades were good enough to earn back the year of eligibility lost to the partial qualification. As a senior team captain in 2006, Baker delivered career highs for receptions, receiving yards, and receiving touchdowns, and was a first-team All-Southeastern Conference selection. Baker's 25-yard touchdown catch provided the winning margin in the Gators' 21–14 victory over the rival Florida State Seminoles. The following week, the Gators defeated Arkansas to win the SEC Championship Gamefor the first time in six years. The Gators would go on to rout the heavily favored Ohio State Buckeyes and capture their second national championship, with Baker catching a touchdown pass for the Gators first score in their 41–14 victory in the 2007 BCS National Championship Game. Throughout his college career, the college football analysts on ESPN called him "Dallas Baker, Touchdown Maker," hearkening back to his nickname from his New Smyrna Beach High School days. He graduated from the University of Florida in December 2006 with a bachelor's degree in health and human performance.
Professional career
Pittsburgh Steelers
The Pittsburgh Steelers chose Baker in the seventh round of the 2007 NFL Draft, and he played for the Steelers from to. He was cut by the Steelers on September 1, 2007, but quickly re-joined the organization as a member of the practice squad on September 2. Baker made the Steelers' 53-man roster out of training camp in 2008. He played in eight games, recording one catch for six yards, before being waived on November 15 to make room for cornerbackRoy Lewis; the Steelers' re-signed Baker to their practice squad on November 19. Baker signed a future contract with the Steelers in February 2009. He was released in final cuts on September 5, 2009.
Jacksonville Sharks
Baker joined the Jacksonville Sharks of the Arena Football League in the early part of the 2010 season, making his AFL debut in the third game of the season against the Orlando Predators.
Baker is the nephew of Wes Chandler, who is a former All-American Gator wide receiver, NFL standout and professional football coach. Baker's younger brother Perry Baker is a professional rugby sevens player and represented the USA in the 2016 Olympics.