A little girl asked her mum, "Mum, may I take the dog for a walk
 around the block?
 
 Mum replies, "No, because she is in heat."
 
 "What's that mean?" asked the child.
 
 "Go ask your father. I think he's in the garage."
 
 The little girl goes to the garage and says, "Dad, may I take
 Belle 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 Belle over here." He took a rag, soaked it with
 gasoline, and scrubbed the dog's backside with it and said, "Okay,
 you can go now, but keep Belle on the leash and only go one time
 around the block."
 
 The little girl left, and returned a few minutes later with no dog
 on the leash.
 
 Surprised, Dad asked, "Where's Belle?"
 
 The little girl said, "She ran out of gas about halfway down the
 block, so another dog is pushing her home."