I am a GA Dobbs researcher have gathered everything on that surname that I can.
1920 census Fulton county: William G DOBBS 27, Nell R 25, Caroline 5, Jamie 1-6/12, Onnie A 21 (listed as boarder, but is bro).
Wm Guy Dobbs appears to be the son of Ellison A Dobbs. 1910 census Fulton county: Ellison A 41, Beulah 36, Guy W 18 Onnie A in 1900 the family is in Franklin county. Ellison A is prob the son of John C Dobbs Olivia C Hutcherson, who is prob the son of Jesse Dobbs Mary Prothro, who is probably the son of Josiah Dobbs Lucy. Email me for more info. I have times, places, and names that appear to tie these families together as well as other information you might want to check.