"Hoots Mon (There's A Moose Loose Aboot This Hoose)" was by Lord Rockingham's XI. They weren't Canadian, they were Scottish. Lord Rockingham himself (real name Harry Robinson) was from the Scottish city of Elgin.
What this Hoots Mon. My post clearly implies that the saying is not Canadian. As you note, it is Scots. Indeed it is regularly bandied aboot colloquially without the benefit of your erudite reference.
I'm with Element here I may drink Single Malt, however I have no Scots Blood. English Blood from around 1066 on my mothers side and an Scottish Aunt - she married in. My dad got rid of the Brother and we kept our beloved Aunt
Now about Aboot, Canadian pure and simple like great Poutine
Guess who is to their North - Canada. The closer you get to the border the more one hears it. In Warroad MN it is more than common, it is the local dialect