There was a hound dog laying in the yard.  An
old man in overalls was sitting on the porch.

"Excuse me, Sir, but does your dog bite?", the
tourist asked.  The old man replied, "Nope."

So the tourist stepped out of his car.  The dog
ran over snarling and growling and bit him on
his arms and legs.  As the dog was dragging
him away, the tourist was flailing around in the
dust and yelled, "I thought you said your dog
didn't bit!"

The old man replied, "Ain't my dog."