Which of the following sentences correctly uses dashes as parentheses to set off a nonrestrictive clause?

My dog -- a golden retriever -- loves to play fetch in the park.

Rewrite the following sentence, replacing the comma and coordinating conjunction with a dash to create a more abrupt interruption: 'The concert was amazing, but it ended too quickly.'

The concert was amazing—it ended too quickly.

When dialogue is cut off abruptly, either by another speaker or an external event.

I can correctly punctuate nonrestrictive clauses using dashes, commas, or parentheses.

1
Dashes can mark interruptions in the structure of a sentence, but feel more "interrupty" than a comma.
2
Dashes can act like parentheses in pairs, setting off information that could be removed without changing the sentence's core meaning.
3
A dash can be used in place of a colon to introduce an idea or a list, or to indicate interruptions in speech.