2007-08: Chosen in the third round of the 2008 QMJHL Draft by the Saint John Sea Dogs.
2008-09: In his QMJHL rookie season, MacAulay scored 2 goals and added 4 assists for 6 points in 47 games. He registered no poiints in 2 playoff games.
2009-10: Playing in his second season with the Sea Dogs, MacAulay netted 8 goals and chipped in 13 assists for 21 points in 56 games. Was a +18 and compiled 39 penatly minutes on the season. In 21 playoff games for the Sea Dogs, MacAulay scored 2 goals and added 8 assists for 10 points.
2010-11: MacAulay provided grit, two-way play, and occasional offense as the third line center for the Memorial Cup champion Saint John Sea Dogs in his third QMJHL season. In 58 games during the regular season he scored 15 goals with 16 assists and was +14 with 36 PMs. In the QMJHL playoffs he scored 6 goals with 4 assists and was +5 with 25 PMs. MacAulay skated in all four games at the Memorial Cup and was an even plus/minus with 1 assist and 4 PMs.
MacAulay is a checker with decent size and an exceptionally hard worker. He has good defensive awareness but his offensive game leaves something to be desired. His acceleration and skating ability are areas in need of improvement.