Out Of Gas

Little Johnnie wants to take his dog Fluffy for a walk. He asks his mother who replies "No the dog is in heat". Johnnie looks at his mother and says," What does in heat mean?" His mother says very carefully so as not to confuse Little Johnnie, "In heat means she has gas." "PLLEEAASSEE!!!" cries little Johnnie. "Okay, but keep the dog on the leash the whole time, and be back in 10 minutes." Little Johnnie leaves with dog in tow and comes back 10 minutes later just as instructed, but without the dog. "Where's Fluffy" mother asks. "Oh, she ran out of gas a couple blocks back so the other dogs in the neighborhood are giving her a push home.