Jameel Grace added 16 points for the Jaguars (10-11, 6-2), including a pair of 3-pointers to start an 18-5 run that gave Southern a 30-18 lead with 5:08 remaining in the first half.
Leading 35-27 at halftime, the Jaguars began the second half with a jumper by Cameron Monroe and maintained a double-digit lead the rest of the way. They had a 20-point advantage, 54-34, with 10:28 left after two consecutive baskets by Doggett.
Ivory White scored 12 points and grabbed 11 rebounds to lead the Hornets (7-12, 4-3), who shot 33.3 percent (18 of 54) to Southern's 54.2 percent (26 of 48).
Doggett blocked six shots and grabbed eight rebounds for Southern, and Grace had five assists.