Pre-prepared bread, meat and or veg and/ or cheese, condiments… sandwich.
Cheeseburgers, hamburgers, sloppy joes, loose meat sandwiches, subs, hoagies, grinders, torpedos, etc. also fall i nto the sandwich catergory.
*as an aside a pizza is a savory pie a la quiche or a pot pie.
Well, in a perfect world they need to have the bun split, because they have too much filling to fit inside otherwise, so we’re back to ‘2 pieces of bread’ at that point.
Not at all. Once you take a single piece of bread and cut in in two, you then have 2 pieces of bread.
I’m not sure I agree with your first statement, but your second one quite succinctly captures the exssence of the argument 
Hot dogs are not sandwiches. If I invite you to lunch for “a sandwich” you know darn well I don’t mean a hot dog. Or a taco, for that matter.
There are beef hotdogs, kosher (no pork) hotdogs, chicken and pork hotdogs, and pork hotdogs. Generally-speaking, the meat is ground into a fine slurry, lightly seasoned (compared to sausage seasonings), stuffed into a tube casing, and pre-cooked.
I say it’s not a sandwich. Sandwiches are made out of stacked, flat-ish things in my world*. If you slice the weenies in half, and then put them on sliced bread, their flat assembly makes it sandwich-ish, to me. Until then, you’re putting round tube shaped things in buns, which isn’t very sandwich-ish to me.
*Yes, this makes the philly cheesesteak and the meatball sub not sandwiches. I’m ok with that, sub overlaps with sandwich, but doesn’t totally intersect. (Is a hot dog a sub? Don’t be silly.) To echo RTFirefly it’s my language, I can do what I want with it.
The “sandwich” is silent.
Yes just one that is turned 90 degrees (usually) to eat.
I disagree that you disagree. The term “hot dog” can refer to either the meat alone or to the meat on a bun. I don’t consider a “hot dog on a stick”, or a hot dog on a skewer or toothpick, to be a sandwich. A sandwich requires a bun (or bread).
I don’t think of ham when I order a hamburger but everyone seems to understand that a hamburger is made of beef. There are other kinds of burgers available, such as bison, ostrich, moose, elk, venison, etc but a hamburger is made of beef.
Definitely not a sandwich. If the definition of a sandwich is a dough vehicle for toppings then me taking a dump on a cracker is a sandwich and that Good Sirs is not a sandwich.
Also: Is a corn dog a sandwich?
There’s a spoken line in Louis Prima’s version of “Yes We Have No Bananas” where some working class guy with a Brooklyn accent says something like “I don’t want any bananas, I just came here to get a hot dog sandwich. Do you have any hot dog sandwiches?”.
Yes, it’s a sandwich. To me, the term “sandwich” is very inclusive. Like “casserole” it’s more of a very large class of similarly formed food items than a specific recipe or variation on a theme.
If it’s portable, and the outside is made with dough and the inside has some sort of cheese or meat filling, it’s a sandwich. Hot pockets are sandwiches. Calzones are sandwiches. Hamburgers are sandwiches. Bacon, egg and cheese biscuits are sandwiches. Po’boys are sandwiches. Philly cheesesteaks are sandwiches. I would even include things like gyros and burritos in the sandwich family. Bread (sliced or flat) wrapped around a filling in order to make it portable (or able to be eaten while playing cards, for example) is what makes a sandwich.
Open faced knife and fork “sandwiches” (like the horseshoe sandwich) are not sandwiches at all, because they’re not portable. That’s where I draw the line.
A number of points…
Had I started a thread with the topic “I think I have solved all the world’s problems” and had, in fact, solved all the world’s problems, I don’t think I would have received 46 replies in 3 hours. 
I thought this was an obvious “Yes”, so I’m astonished to find the answers relatively split down the middle. (See what I did there? Huh? Huh?)
Bup wins the Reductio ad Absurdum award for forming a logic chain which proves that a pizza is a sandwich. Don Pardo, please tell us what he won!
<crickets>
Oh, yeah - Mr. Pardo is dead. Well, if he were alive you would have received a set of Kensington Steak Knives, a Broyhill sofa, and a NEW CAR! But, alas, he isn’t so you won’t.
OH HELL NO! I will come at you like a spider monkey!
I would consider a corn dog to be not unlke an empanada or portable meat pie with a hot dog as the filling and, most often, a vestigial stick.
Corn dogs are greasy and hot. Hence the stick. They fail the “able to be eaten with your hands without getting your cards greasy” standard, which empanadas and meat pies, however, meet.
Have had plenty of fried empanadas and meat pies… greasy as a mofo. We,as a society, evolved into the napkin(s) (as required or preferred), hence the vestigiality of the stick.
For the two piece of bread requiring people… what if I take one slice of bread and spread Peanut Butter and Jelly on it and then fold it over… is this not a sandwich? If not, how about if I eat the end that is the fold first and then suddenly it becomes two individual pieces of bread… did it just become a sandwich in mid consumption?
Sandwiches are food, thus corn dogs are not sandwiches.
What you have there is a ‘half-sandwich’…closely related to, but different than, a ‘sandwich’.
A hot dog is a sausage, made from either pork or beef. I’ve eaten them without the bun. Hot dog can also refer to the sandwich. If one is ordering from a food cart, ‘hot dog’ means sausage on a bun, or, you know a fucking sandwich. If you’re cooking it in your own kitchen, then it can go either way.
I voted for Opal, because it’s so complicated.
My first reaction, was, “Of course not!” but after reading several of the answers, I am inclined to believe that for some definitions of sandwich, hot dogs qualify.
