Puritanical nonsense, and categorically untrue. The Chicago dog, Sonoran dog and chili dog are all firmly cemented in their respective regions, and those are just the first three I could think of.

There’s only one condiment that’s not allowed near my wien, and that’s ketchup. There exists a whole universe of acceptable hot dog condiments otherwise. I’ll prepare an extra “fully loaded” hot dog in your name next time I have that particular hankering.