A little girl wants to take her dog for a walk, so she asks her mother whether she can take Lulu for a walk around the block.
Her mother says “No, sweetie. Lulu is in heat.”
“What does that mean?”, asks the girl.
“Why don't you go and ask your dad in the garage?” says the busy mother.
So the girl goes to her father in the garage and asks “I want to take Lulu for a walk, but mom says she’s in heat and to ask you about it.”.
The father takes a rag, pours some petrol on it, and then rubs Lulu’s backside with it to disguise the scent. “Now you can take her for a walk”, he says. “Just don’t let her off the leash, and she’ll be fine”.
So the little girl skips happily away with Lula trotting along beside her.
A few minutes later she returns with an empty leash, and no Lulu.
Concerned, her dad asked “Where’s Lulu, sweetie?”
“She ran out of gas halfway around the block," the girl replied, "so the neighbor's dog is giving her a push home.”