This story (author unknown) has been 'floating around' the internet for a few months. I found a discussion of it on alt.folklore.urban
. There's an easier to read version of it here
. It involves a fox terrier named Jasper who eats twelve uncooked yeast rolls that a woman leaves out to rise before baking. The yeast begins to rise in the dog's stomach, causing him to swell up like a balloon:
"He looked like a combination of the Pillsbury dough boy and the Michelin Tire man wrapped up in fur. He groaned when he walked. I swear even his cheeks were bloated."
The next day it's worse. The yeast has begun to ferment inside the dog's stomach, causing Jasper to become drunk: "the darn dog was as drunk as a sailor on his first leave. He was running into walls, falling flat on his butt and most of the time when he was walking his front half was going one direction and the other half was either dragging on the grass or headed 90 degrees in another direction."
Finally, it ends with fermented yeast burps, farts, and poops (that are rock-hard like 'Portland cement'). Now, this all sounds an awful lot like an urban legend, especially since it comes from an anonymous source. Would the yeast actually begin to rise and ferment in the dog's stomach, or would it be killed by stomach acid? I'm not sure. I'm guessing that given the quantity of yeast involved (twelve rolls), the yeast might actually cause the dog's stomach to swell quite a bit... so something like this could happen. Though whether it actually did happen is anyone's guess.