Dobbie was appointed "Queens" new club captain after John Rankin departed to join Clyde during the 2018 close season. On 17 July 2018, Dobbie scored his fifth hat-trick since his return to the "Doonhamers" versus Clyde in a 3–0 win in the Scottish League Cup at Palmerston, his first treble of the season. Dobbie's sixth hat-trick since his return to the "Doonhamers" and his second of the season was scored on 25 August 2018 in a 3–0 win away to Falkirk in the Scottish Championship.