A hot dog is an item between two pieces of bread

The argument

The basic definition of a sandwich in the Merriam-Webster dictionary is "two or more slices of bread or a split roll having a filling in between". That fits the description of a hot dog PERFECTLY: it's a split roll with a piece of meat in the middle. Having the definition in the most commonly used dictionary in the world certainly makes an irrefutable argument in favor of the hot dog's standing as a sandwich. A sandwich is a hot dog, and in the same such way a hot dog is a sandwich.

Premises

Counter-arguments

The dictionary does not specify EXACTLY if a hot dog can be classified as a sandwich. The definition of a hot dog in the same dictionary also does not match the definition for a sandwich. It's like rectangles and squares - a rectangle is a square but a square is not considered a rectangle.

Rejecting the premises

[Rejecting P1] A dictionary records how a word is used rather than settling a disputed classification, and the same dictionary carries a separate entry for the hot dog — which is itself evidence that ordinary usage treats the two as different things. [Rejecting P2] The roll is split rather than cut through, so on a stricter reading the bread is one piece rather than two, which is the feature the opposing side rests on. Calling the case irrefutable also overstates it: the definition is what is in dispute, so citing one cannot end the dispute.