He decides to go to the vet to get it looked at.
The vet takes one look at the horse and says, "We have a very special treatment for crossed eyes in horses. Stand back."
He sedates the horse and takes out a tube that's about six feet long, then carefully inserts about three feet of it into the horse's anus. He then blows as hard as he can into the end of the tube; then he lifts the horse's eyelid and sees that its eyes are still crossed. He blows some more and checks again - still nothing. Eventually he's red in the face and the horse's eyes are still crossed.
He offers the end of the tube to the horse's owner. "You want to give it a shot?" The owner nods, then carefully pulls the tube all the way out, flips it around, and inserts it back in the other way.
The doctor is confused. "Why'd you do that?"
The owner replies: "You think I'd put my mouth on that end after you?"
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