Lawrence, before you order any service/pension records please consider you will generally find these soldiers enlisted in companies formed in the county where they resided. The two Dotson's in this unit enlisted in Kosiusko, Attala County, MS.

Company C (Buford's Company), 11th. MS Cavalry (Perrin's) was raised in Attala County.
http://mississippiscv.org/MS_Units/11th_MS_Cav.htm

1860 Attala County, Mississippi Census
Name: Garner M Dotson
Age in 1860: 46
Birth Year: abt 1814
Birthplace: Tennessee
Home in 1860: Township 13 Range 8, Attala, Mississippi
Gender: Male
Post Office: Kosciusko

Household Members:
Name / Age
Garner M Dotson 46
Susan S Dotson 45
Alva E Dotson 22 <<<<<
O C Dotson 18
Milton E Dotson 14 <<<<
Felix A Dotson 12
Lewis Dotson 9
Zilda Dotson 6
Theodosia S Dotson 4

1850 Attala County, Mississippi Census
Name: G M Dodson
Age: 37
Estimated Birth Year: abt 1813
Birth Place: Tennessee
Gender: Male
Home in 1850: Township 14 R 8 E, Attala, Mississippi

Household Members:
Name / Age
G M Dodson 37
Susan L Dodson 35
Jas B Dodson 14
Ebenezer Dodson 12 <<<<
Oscar Dodson 10
Milton Dodson 8 <<<<
Felix Dodson 4

The G. M. Dotson family lived in Pickens County, AL in the 1840 Census.