From “The Dog and the Wolf” by Marmaduke Park

A wolf there was, whose scanty fare

Had made his person lean and spare;

A dog there was, so amply fed,

His sides were plump and sleek; 'tis said

The wolf once met this prosp'rous cur,

And thus began: "Your servant, sir;

I'm pleased to see you look so well,

Though how it is I cannot tell;

I have not broke my fast to-day;

Nor have I, I'm concern'd to say,

One bone in store or expectation,

And that I call a great vexation."

Who is speaking in the dialogue of this selection?