My father bought a bag of snausages and gave 1 to Bubba. He too had some serious runs afterwards. To the point that I was about to take him into the vet. I checked the ingredients that when I discovered the problem... Bubba is sensitive to corn and wheat.
Soy Flour, Wheat Flour, Corn Syrup, Corn Starch, Chicken, Water, Propylene Glycol, Animal Digest, Bone Phosphate, Bacon, Beef, Soy Protein Concentrate, Animal Fat (BHA used as a preservative), Dried Cheese Product, Sugar, Salt, Potassium Chloride, Phosphoric Acid, Sorbic Acid (used as a preservative), Titanium Dioxide, Natural Smoke Flavor, Yellow 5, Yellow 6, Red 40, Garlic Powder, Citric Acid (used as a preservative), Blue 1.
Sounds like Fumble is sensitive to something in them also.