A FILTHY DIRTY DISGUSTING DULUTH LIMERICK

Okay, I composed this limerick many years ago, have recited it (or versions of it) a number of times in the past but have never written it down. It's time to publish it (I haven't read the Perverse Verse Book yet so maybe something similar is already in there--if so, my apologies). Here goes:

There once was a man from Duluth,
Whose manners were very uncouth.
He'd sit in the grass,
And pick his dog's ass,
And scrape the shit off on his tooth.