A number of health issues, some of them
hereditary, have been found in individual Shih Tzu, and are listed below. The popularity of the breed has allowed for extremely poor breeding in general, leading to generalized and lifelong diseases, often from a fairly early age.
Heart disease Mitral valve disease is the most common heart disease in dogs and can lead to
congestive heart failure (CHF). The condition is more common in smaller dogs including the Shih Tzu.
Brachycephaly The
short nose of the Shih Tzu causes breathing difficulties and other health issues in the dog.
Brachycephalic airway obstruction syndrome (BAOS) is a condition caused by brachycephaly. The main issues arising from the shortened muzzle are
stenotic nares, where the nostrils are close together causing difficulties with breathing through the nose; an elongated
soft palate; and tracheal hypoplasia, a narrow windpipe. This causes difficulty breathing which leads to increased respiratory effort which further narrows the trachea which can lead to laryngeal collapse. Dogs suffering from BAOS struggle with exercise, are prone to heat stroke due to ineffective evaporative ability, and have
trouble sleeping.
Eye issues It is very common for Shih Tzus to develop eye problems at any age, and even more so once they are older. Most veterinarians will recommend eye drops to assist with any eye irritations. Some dogs have allergies which cause excess discharge around the eye. Older Shih Tzu are known to develop cataracts which can be corrected with surgery. If not treated, the dog may become blind in the eye that has the
cataract. The distinctive large eyes can easily be scratched which may cause an ulcer. The dog will normally have the injured eye closed or half closed and may have excessive tears. The most common problem of Shih Tzus concerning eye conditions is the formation of
epiphora caused by the fur on the eyelids scratching the conjunctiva and the cornea. However this can be medicated by the application of prescribed eye drops from a certified veterinarian such as eyevita. Shih Tzus are also prone to excessive tear production which in turn cause tear stains around the eyes. A study from Japan reviewing cases of dogs presented for
ophthalmologic examination found the Shih Tzu to make up 16% of all glaucoma cases whilst only making up 8.2% of the total population used in the study.
Ear issues A very common issue for Shih Tzus is the development of ear infections, as they have a long coat and hair grows in their ears. If ears are not plucked and cleaned often, ear infections will reoccur and cause more serious health issues.
Life expectancy A 2022 study in the United Kingdom found the life expectancy of the Shih Tzu to be 11 years, a few months below the average life expectancy of all dogs. A 2024 UK study found a life expectancy of 12.8 years for the breed compared to an average of 12.7 for purebreeds and 12 for
crossbreeds. A Japanese study found the Shih Tzu to have a life expectancy of 15 years, above the 14 year average for all dogs. == Variations ==