Dog Ran out of Gas

One day a little girl asked her Mom, "Mom, may I take Lucy for a walk around the block?"

The Mom said, "No, because she's in heat."

"What's that mean?" asked the child.

"Go ask your Father. I think he's in the garage."

The little girl went to the garage and said "Dad, can I take Lucy for a walk around the block? I asked Mom, but she said the dog was in heat, and that I should ask you."

Dad said, "Bring Lucy over here." He took a rag, soaked it with gasoline, and scrubbed the dog's butt with it.

"OK, you can go now, but keep Lucy 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.

Dad said, "Where's Lucy?"

The little girl said, "Lucy ran out of gas about halfway down the block. There's another dog pushing her home."