OK I know I should not have started this 
But hey what the hell 
I blame Rusty for this:
A man sees an Ad in the paper.' Talking dog for sale - £10'
Thinking it must be wrong, he phones the owner and asks if it's a mistake.
"No come over and see for yourself"
she says.
He visits the owner and is brought through to meet the dog.
"Hello" the dog says
"I expect you'll want to hear a bit about me?"
Speechless - The man sits down while dog continues to talk
"I have been entered into crufts 3 times and won each time.
I was getting a bit bored of dog shows and decided to join the police as a sniffer dog. During my time I was resonsible for the arrest of over 50 people and won dozens of awards and trophies for my outstanding work. After a few years I left to join customs. In my time there I prevented over £5 million worth of drugs being brought into the country and managed to sniff out the largest consigment of class A drugs ever caught by UK customs.
I've had a great time, but now I'm retired so I've moved in with Mavis to keep her company"
The man walks back through to Mavis and says
"That dog is amazing, why on earth do you want to sell him?"
Mavis replies
"Because he's a bl**dy liar!"