Joey was a big yellow Lab. He liked to sleep on the porch. He took long naps there. One day Joey was taking a nap. He woke up because he had an itch behind his ear. He scratched the itch with his big hind foot. Joey was a smart dog, but he did not know why he had an itch. He tried to go back to sleep. He had another itch. This time the itch was on his shoulder. He scratched again with his big hind foot. Poor Joey! He could not sleep. His owner saw Joey scratching. What was wrong? Joey's owner scratched Joey behind the .....