Writing prompt 3

You writing prompt for this week consists of a few of lines of dialogue. If you're using these as warm-up exercises, remember that you don't have to come up with a coherent story or anything; the prompt is just a jumping-off point. Try letting your mind go wherever it wants and see what happens.

Prompt:
"Hey! Girl! Didn't I see you walking here a couple days ago with a dog?"

"Yeah, what of it?"

"Where's your dog today?"

"Oh, that. I had to eat him."