Dow had started as an apprentice at the Montreal brewery of Thomas Dunn, established in La Prairie in 1790.
The Quebec City brewery stopped its activities on March 31, 1966,[5] and production of the Dow brands moved to other plants.
In August 1965, a patient presented to a hospital in Quebec City with symptoms suggestive of alcoholic cardiomyopathy.
[6] Epidemiological studies found that Dow had been adding cobalt sulfate to the beer for foam stability since July 1965 and that the concentration added in the Quebec city brewery was 10 times that of the same beer brewed in Montreal where there were no reported cases.
The Molson Black Horse Ale sold today in Newfoundland is a different product.