It had a curious passage, at least to me. I'm not a big hot dog eater--though I used to be--so maybe I'm just ignorant, but I don't understand this quote.
"A kosher hot dog is all beef and made under rabbinical supervision. It is skinless or stuffed into collagen casings, because natural casings are not permitted."
Why would natural casings not be permitted? Aren't they used in kishke?