You Can't Teach An Old Dog To Fly (Dog Joke)

A woman called our airline 
customer-service desk asking if she could take her dog on board.“Sure,” I said, “as long as you provide your own kennel.” I further explained that the kennel needed to be large enough for the dog to stand up, sit down, turn around, and roll over.
The customer was flummoxed: 
“I’ll never be able to teach him all of that by tomorrow!”

Source:http://www.rd.com/jokes/dog/