Talking canine

One does not often hear a good funny joke often these days. Jokes seem to have gone out of fashion. This is one that was told to me by an American guy in a restaurant the other evening and it tickled the old funny bone!
A guy is walking down the street in a American town when he notices pinned to the fence of a house a note that says " meet the talking dog 20 bucks" His curiosity gets the better of him and he knocks on the door. A guy answers it and he asks if he really has a talking dog, the guy says sure come on in.
He asks for the twenty dollars but the man says he will give it to him after he has seen the dog. The guy says sure whatever! He goes into the front room and lying on the floor is a mangy dog of questionable parentage who opens one lazy eye and looks at him. Can you really talk? Sure the dog replies. The man is stunned, it really is a talking dog. Tell me a bit about yourself he asks. The dog sits up yawns and says. Well I was born in France and my first language was French. When I grew up because of my intelligence I became a spy and worked for the espionage services. Then I moved to UK, where I learnt English and became the companion of a very famous Countess and we were photographed in all the papers at many events. She died so I decided to travel to the USA and I met this guy and have stayed with him ever since!
As he left he gave the guy the money and shaking his head in disbelief said that dog is amazing. The guy smiled and looking straight at him replied. That dog is a liar!