A guy is driving around the back woods of Scotland and he sees a sign in front of a broken down farmhouse:
Talking Dog for Sale
He knocks on the door and the owner appears and tells him the dog is in the back garden.
The guy goes into the garden and sees a nice looking Labrador retriever sitting there.
"You talk?" he asks.
"Ay!" the Dog replies.
After the guy recovers from the shock of hearing a dog talk, he says "So, what's your story?"
The Dog 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 MI5 and they had me inducted into the toughest branch of the armed services ... The SAS ."
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 retired from MI5 (8 dog years is 56 MI5 years) and signed up for a job at the airport to do some undercover security, wandering near suspicious characters and listening in."
"I uncovered some incredible drug deals and was awarded a batch of medals.. I got married, fathered lots 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.
"£10," the guy says.
"£10? This dog is amazing! Why on earth are you selling him so cheap?"
"Because he's a liar! He never did any of that drivel. He was in the Navy!"