I don't understand this joke?

Question

Jonathan who is noted for his tact was awakened one morning at four o'clock by his ringing telephone.

"Your dog's barking, and it's keeping me awake," said an irate voice.

Jonathan thanked the caller and politely asked his name before hanging up.

The next morning at four o'clock, Jonathan called back his neighbor. "Sir," he said, "I don't have a dog."

Answer 1

good one :-)

Answer 2

that makes two of us

Answer 3

its like hes getting evening for that early morning call

Answer 4

good old jonathon got even for the ake up call. he asked the guy's name so he could get his phone number and make the revenge call.