In my region of Brazil we have three flavors (!!!!) of hot dog: beef (filled with meaty Bolognese), chicken (shredded chicken cooked in tomato sauce) and mixed (both; yes, BOTH!!).
Things Brazilians put in hotdogs:
Hot dogs. How many, you ask? Well, how many do you want?
Mmmm... With double the nitrates, double the grease, and double the sodium who wouldn't want this??? Go ahead and have 2 or 3 of them! If eating doesn't make you break out in a sweat then you're not doing it properly!
Anne's Dairy Cream in Maryland will sell you a foot long double dog. They make their own bread, place is absolutely amazing.
Oh and just to be clear, The dogs are amazing, The cheesesteak is really good for Maryland, but the place itself is actually a little dive. I think there are seven seats inside all at the counter. I just want to set expectations in case anyone goes out of their way to visit.
In case anyone from the UK needed another reason to prostrate themselves before the altar of Scandinavian interior design and foodstuffs this weekend, IKEA UK now sells the double hotdog at the exit bistro.
Hot dogs are fucking gross though. It's already hard enough to drown them in enough sauerkraut, mustard, onions, etc, to make them choke-downable. Hamburgers are different, it's actually (usually) reasonably good meat as a base, doubling it makes sense.