The left sided player joined Accies from Clyde earlier this summer but has struggled to break into Alex Neil's first team plans and the Hamilton boss has opted to send him on loan to Dumbarton to gain further first team experience.
The 21-year-old joined Clyde from Motherwell as a left midfielder but Bully Wee boss Jim Duffy quickly converted him to a left back.
During his time at Clyde a number of impressive performance earned him his move to Premiership Accies.
MacDonald's dangerous left foot will provide Sons with another set piece option while his willingness to attack from left back while he will also provide competition for Scott Linton's left back role.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article