I think he's saying what makes it a hot dog is taking that particular sausage, the frankfurter, and putting it in a bun.

I like a good all beef hotdog personally. My favorite sausage is probably the German knackwurst. The pink ones over the white ones. So basically a frankfurter on steroids (and probably growth hormones.......and other stuff).

I like mine with all kinds of stuff. Chilli, cheese, jalapenos, pickles, ketchup, mustard, relish, onions, tomatoes, on and on.

Not at one time, but just as options. I think it's silly that ketchup on hotdogs is considered so terrible in Chicago.