No. No it isn't. And let me ♥♥♥♥♥♥♥ tell you why. Sandwiches are held like this = where each line represents a piece of bread and the empty space is the stuff inside. A hot dog looks like this from above | | where the two parallel lines are the buns and the space is the hot dog and various condiments. Were you to turn your hot dog like this = all your relish, ketchup, and other various things would fall out and you'd be stuck with little to nothing but a wiener in between A SINGLE PIECE of bread. However were you to turn a sandwich like this | |, the worst that would happen, provided it was made correctly, is that it would just be hard to eat. This is my argument, I will defend it to my last breath.
A hot dog. Is not. A sandwich.

Is a hot-dog a sandwich?