Pet owners have long been frustrated by age-related behavior changes, including house-training problems, apparent
memory loss, disorientation, confusion, staring, wandering, getting stuck in corners, sleep disturbances (waking at the wrong time, sleeping unusually deeply, night pacing), restlessness, barking, separation anxiety, panting, drooling, obsessive licking, etc. Progression of clinical signs is very gradual; most owners fail to recognize the early stages.