On 1 September 2018, Dobbie scored his seventh hat-trick since his return to Palmerston in a 5–0 win at home to Ayr United in the Scottish Championship, his third treble of the season; the first three goals arrived in a ten-minute spell during the first half (12, 20 and 22 minutes), with his second goal being a penalty kick. Dobbie then had a penalty saved in the 31st minute by Ayr goalkeeper Ross Doohan. Dobbie scored his fourth goal of the match in the 84th minute. On 15 September 2018, he played in his 200th match for the "Doonhamers" versus Ross County in a 0–0 draw. At that point his record for "Queens" included 182 starts and 18 substitute appearances.