What are the common signs and symptoms of a leopard gecko dying, and what can be done to prevent it?

Common signs and symptoms of a leopard gecko dying include lethargy, loss of appetite, weight loss, difficulty shedding, and unusual behavior. To prevent this, ensure proper husbandry such as providing a suitable habitat with proper temperature, humidity, and lighting, a balanced diet, regular veterinary check-ups, and handling the gecko gently to minimize stress.