The average Shih Tzu lifespan is a little over 13 years. The average purebred lives around 11 years. However, small dogs like the Shih Tzu generally live longer than larger ones.
Tracheal collapse is a potentially fatal disease in Shih Tzus. When the windpipe (trachea) gets weak, the organ can flatten and prevent air from entering your pups’ lungs.
Never give your Shih Tzu water from unchecked sources. This also includes unfiltered tap water. Their sensitive kidneys can suffer a lot of damage even from a small number of toxins.