Kosher Hot Dogs
I love Kosher Hot Dogs; especially Shofar brand. I am not familiar with the Kosher Laws; but I know that a hog's casing would be prohibited. Is there any such prohibition against a natural sheep casing or a collagen casing? I love a natural casing on my hot dog, but have yet to see a Kosher dog with one.
No kashrut law against natural casing. In fact, Kishke, or stuffed derma is traditionally wrapped in a natural casing. Very hard to find nowadays with the commercial products.
As for the hot dogs, this too is hard to find. I have never seen a commercially available brand that has them on the east coast. However, I have seen hot dogs with natural casings at local kosher butcher shops. If there is one in your area, you can try there.