A little girl asked her mom if she could walk the little dog around the block

Her mom said no!! She's in heat. The little girl asked what's in heat? Mom said your dad is right there in the garage ask him. So she goes to the garage and asked her dad if she could walk the dog. She told him her mom said she was in heat and what's that, so the dad grabs little Lulu and takes some gasoline and rubs it all over her hind end to hide the smell. Then put a leash on Lulu and told the little girl no matter what don't let go of the leash ok? She said yes. Then he said one time around the block then come back in ok? She said yeah. And off she goes.
She comes back in a while and had the leash but no lulu. Her dad asked where's Lulu? And the little girl said Lulu ran out of gas half way around the block and the neighbors dog is pushing her home .