Very funny Mike!

A guy is driving around the back woods of Cambridge and he sees a sign in front of a broken down shanty-style house: "Talking Dog For Sale."

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

The guy goes into the backyard and sees a nice looking Welsh Springer Spaniel sitting there.

"You talk?" he asks.

"Yep," the Welsh Springer Springer replies.

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

The Welsh Springer Spaniel looks up and says, "Well, I discovered that I could talk when I was pretty young. I wanted to help the government, so I told MI6. 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 running."

"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 batch 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 Pound," the guy says.
"Ten Pound? 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."