<<Disclaimer: Verify this information before applying it to your situation.>> For any Costco shopping celiacs, my local Costco sell the Casual Gourmet sausages mentioned in the last digest. They also sell the Denver Buffalo Company brand buffalo hotdogs. I called the Denver Buffalo Company and the natural flavorings include only spices such as thyme, rosemary, etc. I didn't delve any further as to whether the spices themselves had residual flour to prevent clumping. These hotdogs are huge and rather pricey, about $8 for 12 hotdogs. However, they are great tasting. Even my picky three year old ate over four ounces of meat at one sitting! Cheryl in Colorado