Average Lifespan Of A Shih Tzu. With that being said, if you want to extend your shih tzu's life expectancy you need to make sure you are keeping them active, taking proper care of them, and having them visit the veterinarian on a regular basis. The average shih tzu lives for approximately 13 years [ 1 ].
The average lifespan of shih tzu is from 10 to 18 years. For this reason, shih tzu dogs are considered to be seniors by the 10 year mark. The age that a shih tzu becomes a senior with the shih tzu, the average life span is 13 years, though this can range from 12 years to 16 years;