A little girl asks her mom, "Mom, may I take the dog for a walk around the block?"
Her mom says, "No, because the dog is in heat."
"What`s that mean?" asks the child. "Go ask your father. I think he`s in the garage."
The little girl goes to the garage and says, "Dad, can I take Susie for a walk around the block. I asked mom but she said the dog was in heat and that I should ask you."
Her dad says, "Bring Susie over here."
He takes a rag, soaks it with gasoline, and scrubs the dog`s behind with it and says, "OK, you can go now, but keep Susie on the leash and only go one time around the block.
The little girl leaves and returns a few minutes later with no dog on the leash.
Her dad says, "Where`s Susie?"
The little girl replies, "Susie ran out of gas about halfway down the block, and there`s another dog pushing her home."