A little girl asked her Mom, "Mom, may I take the dog for a walk around the block?"
Mom says, "No, because the dog is in heat."
"What does that mean?" asked the girl.
"Go ask your father. I think he is in the garage."
The little girl went to the garage and asked, "Dad, may I take Susie for a walk around the block? I asked Mom, but she said that Susie was in heat, and to come talk to you."
Dad said, "Bring Susie over here."
He took a rag, soaked it with gasoline, and scrubbed the dog's rear-end with it and said, "Okay, you can go now, but keep Susie on the leash and only go one time around the block."
The little girl left, and returned a few minutes later without Susie.
Her father asked, "Where is Susie?"
The little girl said, "She will be here in a minute, she ran out of gas about halfway down the block and another dog is pushing her home."

I forgot that joke. It was so good to see it again. Thank You,Mehulkamdar.