Yes, I'm looking at Frisky Animals on Parade #2 again, and that story of Spunky the Joey (earlier picture, https://www.furaffinity.net/view/39788655/ ). Here, in a panel from the top of https://comicbookplus.com/?dlid=76353 page 13, we see how he gets himself into his scrape, by thinking this big canister of gas is maybe 'something good to eat'. It's the most unsettling fun you'll have at the dentist's all year! Drawing that mid-century dentist chair was fun, too. It's not close to anything I'd drawn before. Spunky's whole story is a bit of spherical kangaroo fun but if you do choose to read it, be aware that it includes hunting, and hunting rifles fired at characters, and think about whether you need that stuff in your goofy, somewhat ironic recreational reading. The story starts on page 11.

Also, don't wait for your dentist to step out of the room and then stuff a tube in your mouth and turn the gas on full. It doesn't work out like this nearly enough.