A dog joke

A little boy called Graham asked his Mum: ‘Mum, may I take Fluff for a walk around the block?’ Mum replies, ‘No, because she is in heat.’
‘What’s that mean?’ asked little Graham.
‘Go ask your father. I think he’s in the garage.’
Graham goes to the garage and says, ‘Dad, may I take Fluff for a walk around the block? I asked Mum, but she said the dog was in heat, and to come to you.’
Dad said: ‘Bring Fluff over here.’ He took a rag, soaked it with petrol, and scrubbed the dog’s backside with it to disguise the scent, and said: ‘OK, you can go now, but keep Fluff on the leash and only go one time round the block.’
Graham left and returned a few minutes later with no dog on the leash. Surprised, Dad asked: ‘Where’s Fluff?’
(YOU’RE GONNA LOVE THIS!!!)
Little Graham said: ‘She ran out of petrol about halfway down the block, so another dog is pushing her home!

Comentati?