There was this blonde city-girl who was out driving and found
herself in a rural area. She noted a farm animal standing next
to a farmer and stopped the car to ask the farmer a question.

"Sir," she inquired, "Why doesn't this cow have any horns?"

The farmer cocked his head for a moment, then began in a patient
tone. "Well, ma'am, cattle can do a powerful lot of damage with
horns. Sometimes we keep'em trimmed down with a hacksaw. Other
times we can fix up the young 'uns by puttin' a couple drops of
acid where their horns would grow in, and that stops 'em cold.
Still, there are some breeds of cattle that never grow horns.
But the reason this cow don't have no horns, ma'am, is 'cause
it's a horse."