The lifespan of a Shih Tzu dog typically ranges from 10 to 16 years, with many living into their early teens. Their longevity can be influenced by factors such as genetics, diet, exercise, and overall care. Regular veterinary check-ups, a balanced diet, and a loving environment contribute to a longer, healthier life. Shih Tzus are generally healthy dogs, but they can be prone to certain health issues like dental problems, respiratory issues, and eye conditions, which should be monitored throughout their life.