A little girl goes up to her father who is working in the garage and asks him if she could take the dog for a walk.
"I'm not sure," he says, "She is in heat."
"What does that mean ?" she asks.
"Well it mean she needs a little gas, that's all," he replied.
So he takes out a rag, pours a little gasoline on it, and scrubs the dog's backside.
"Okay," he says to his daughter, "don't be gone long."
The little girl and the dog run off, but 10 minutes later she returns alone.
"Where is the dog?" her father asks.
"Oh, she ran out of gas a block ago," she answered. "But don't worry. Another dog is pushing her home."
