Lew Wallace
Dawson played high school basketball for Lew Wallace, under coach Renaldo Thomas. He had to sit out most of his freshman season, being academically ineligible. Dawson was selected for the 2011 McDonald's All-American Boys Game following his senior year. In his senior season, Dawson helped his team win the sectional championship; scoring a team-high 13 points, also adding 8 rebounds and 6 steals to his numbers, he helped his Lew Wallace get past Clark. In the regional finals against Western, Dawson had game-highs in scoring and rebounding with 28 and 15 respectively, but his team lost 69–65. As a senior, he averaged 28.7 points, 18.6 rebounds and 5.6 assists for Lew Wallace. Dawson was a five-star recruit according to both Rivals.com and Scout.com and received a 96 grade by ESPN.