DID YOU KNOW? Dog's can't look up? It's crazy but true!
According to research: "Due to the construction of a dogs neck and spine, it is physically impossible for them to look upwards. In order for a dog to look up at something high they must assume the sitting position"
From "Dog Training Obedience & Behavior Moddifications" - http://www.about-dogs.com/dog_training_obedience.htm