A Man Asks For A Free Drink If He Can Prove His Dog Can Talk

A man walks into a bar with his dog. 

This is a talking dog. If this dog can answer my questions, who will buy me a drink?" he asks. 

You can have one on the house," the bartender says. 

The man turns to his dog. "What goes on the top of a house?"

Dog: "Roof!"

Man: "What does tree bark feel like?"

 Dog: "Rough!" 

 Man: "Who is the greatest baseball player ever?" 

 Dog: "Ruth!" 

 The bartender is clearly annoyed and snaps at the man. "That's enough. You and your dog, get out." 

 After the man and the dog are thrown out, the dog looks sadly at his owner. "Should I have said DiMaggio?"