A man sees a sign in front of a house: "Talking Dog for Sale."

He knocks on the door and the owner tells him the dog is in the backyard.

The guy goes into the backyard and sees a mutt just sitting there.

"Can you talk?" he asks.

"Yes," the mutt replies.

"So, what's your story?"

The mutt looks up and says, "Well, I discovered this gift pretty young and I wanted to help the government, so I told the CIA about my gift, and in no time they had me jetting from country to country, sitting in rooms with spies and world leaders, because no one figured a dog would be eavesdropping.

I was one of their most valuable spies eight years running. The jetting around really tired me out, and I knew I wasn't getting any younger and I wanted to settle down. So I signed up for a job at the airport to do some undercover security work, mostly wandering near suspicious characters and listening in. I uncovered some incredible dealings there and was awarded a batch of medals.

I had a few flings, a bunch of puppies, and now I'm just retired."

The guy is amazed and he goes back to the front door and asks the owner what he wants for the dog.

The owner says, "Fifteen dollars."

The guy says, "This dog is amazing. Why on earth are you selling him, so cheap?

"The owner replies, "He's such a liar. He didn't do any of those things."