The keen hunter wished at that moment he had a weapon in the car but then common-sense prevailed.
"I didn't want to spark an Armed Offenders callout so I shot him on my phone instead, for all my friends on Facebook and Instagram."
He followed the large boar down off Clyde St and along Elizabeth St.
"He was a big fella and looked to be between 72 to 77kg in weight, he was just wandering along the road past Holmdene then he headed down towards the river, I lost sight of him when he reached the Clutha River bank," Macaulay said.
The video has drawn a lot of comments on Macaulay's Facebook page, and some people are talking about a return to the area to seek out the porker.
Clutha District Council Communications spokesperson Sue Wilkins confirmed the council did receive a notification about a black and tan pig being seen in Hospital Rd overnight.
"The issue was passed on to our roading contractor and we do not know of the outcome; however, it is unusual for us to get wild animals wandering around in town, although we do get the occasional sheep reported," she said.