Col. Pud’s Single Shot is great from cover to cover. It features anthro art with a style and a sense of humor you rarely see in today’s comics, let alone a furry fanzine from 1981.
But it also holds a mystery, it seems it was published for something called Denvercon. Which after repeated searches I found nothing on, and have asked the Greymuzzle community at large to see what they know. But for now it’s a mystery.
Furry Times 
It’s an APA that was made by furs at Worldcon 39 (Denvention 2). So people made copies of their contributions and then a party was had at the con where the issues were collated together.
https://en.wikipedia.org/wiki/Amateur_press_association
https://en.wikipedia.org/wiki/39th_World_Science_Fiction_Convention
Thank you very much for solving a furry mystery