A yoke

A salesman is passing a farm house and sees a sign. ”Talking dog for sale.”
Stopping he asks “Can your dog really talk?”
The farmer answers “He’s tied out back …ask him yourself!”
The salesman walks behind the farmhouse finds a tethered black Labrador and asks,
“Can you speak?”
“Yes since I was a pup!” The dog answers.
The salesman, “Wow! How many people know you can hear and speak English?”
The dog, “Lots! I just retired from the CIA after serving years as a spy in Iraq, Afghanistan, Iran, Syria, and China.”
The salesman to the farmer, “I want that dog how much?”
The farmer, “Ten dollars!”
The salesman, “$10…why so cheap?”
The farmer, “Because he’s a big liar!”