[Old Fart]

A little girl was leading her dog through the park when an old man stopped her, saying, "That's sure a pretty dress you're wearing."
The little girl smiled, "Thank you, Sir. My mama bought it for me. This is my dog Porky."

The old man chuckled, "I'll bet a nickel I can guess why you called him that."

She shook her head, "I'll bet you can't."

He laughed, "You called him Porky because he's so fat."

She shook her head. "No Sir, we call him that because he f**ks pigs."