Silent cues are useful in any situation where your dog can't hear you, whether he's across a field from you, with you at a parade, if he's deaf, or suffering age-related hearing loss. There are two philosophies about training dogs with hand signals. Some people like to use small, subtle signals, barely visible to the human eye. A tiny finger movement cues the dog to lie down. Another elicits a sit. A small wave sends the dog into heel position. Impressive it appears that the dog is mind-reading!