Ha Ha!

A guy is driving around the back woods and sees a sign in front of a broken down shanty:

"Talking Dog For Sale"

He rings the bell and the owner tells him the dog is in the backyard.

He goes out back and sees a Golden Labrador sitting there.

"You talk?" he asks. 

"Yep," the Lab replies. 

After the guy recovers from the shockof hearing a dog talk,he says "So, what's your story?"

The Lab looks up and says, "Well, I discovered that I could talk when I was a pup. I wanted to help the government, so I told the CIA. In no time at all 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 for eight years straight. But the jetting around really tired me out, and I knew I wasn't getting any younger so I decided to settle down. I signed up for a job at the airport to do some undercover security, wandering near suspicious characters and listening in. I uncovered some incredible dealings and was awarded a bunch of medals. I got married, had a mess of puppies, and now I'm just retired." 

The guy is amazed. He goes back in and asks the owner what he wants for the dog. 

"Ten dollars," the guy says.

"Ten dollars? This dog is amazing! Why on earth are you selling him so cheap?" 

"Because he's a liar. He never did any of that stuff!"