Ancestry.com provides three records at Andersonville Prison for Dawson Bowles of the 4th. KY.
D. Bouls - CO D
Dawson Booles - CO D
Dawson Bowles - CO "D" (The "D" was marked thru and replaced with B)
As Mark suggests, his military and pension records should provide the answers to your questions.
These records can be ordered from this site which helps to support these message boards.
http://history-sites.com/research/index.html