A Shih Tzu’s Typical Lifespan Is About 12–13 Years

A practical answer is about 12–13 years. A large 2024 UK study estimated median survival for Shih Tzus at 12.8 years, with a 95% confidence interval of 12.6–12.9 years. Its Shih Tzu dataset included 12,007 dogs, of whom 5,894 had died (Dogs Trust breed table).

That is a population midpoint, not an expiration date: half of the studied Shih Tzus survived beyond 12.8 years and half did not. The American Kennel Club lists a much broader 10–18-year life-expectancy range, showing that individual outcomes vary substantially (AKC breed profile).

Why published Shih Tzu lifespan figures differ

“Average lifespan,” “median age at death” and “life expectancy at birth” are not interchangeable measures. Studies also use different populations and methods.

• The 2024 analysis combined veterinary, insurance, welfare and breed-registry data from 584,734 UK dogs. It estimated the Shih Tzu’s median survival at 12.8 years. The researchers caution that their results apply to the UK population studied and cannot identify the direct causes of earlier death (Scientific Reports study).
• A breed-specific VetCompass study reported a similar median age at death of 12.7 years. The middle half of its recorded death ages fell between 8.7 and 14.3 years, with no statistically significant difference between males and females. However, although the overall study population included 11,082 Shih Tzus, only 85 dogs had a recorded age at death, so that mortality estimate warrants caution (VetCompass study).
• A separate UK life-table analysis estimated Shih Tzu life expectancy at birth at 11.05 years. The authors explain that country, data source, breed popularity and missing early puppy deaths can all influence estimates (2022 life-table study).

These figures do not establish one guaranteed lifespan. For household planning, 12–13 years is a useful midpoint, while allowing for the possibility of a substantially shorter or longer life.

When does a Shih Tzu become senior?

There is no universal senior birthday. The American Animal Hospital Association defines the senior stage for dogs as the last 25% of estimated lifespan and notes that aging varies by breed and individual (AAHA senior-care guidelines).

Applying that framework to a 12.8-year median puts the start of the senior stage at roughly 9–10 years old. This is only a planning guide. A veterinarian may recommend senior-focused examinations or screening earlier or later based on the dog’s medical history and current health.

Track changes in appetite, drinking, urination, bowel habits, weight, mobility, sleep, behavior, vision and breathing. Do not assume a new change is simply old age; a record of when it began and whether it is progressing can help the veterinarian assess it.

Health areas to watch throughout life

In the breed-specific VetCompass study, the most commonly recorded specific disorders were periodontal disease, anal-sac impaction and ear disorders. Skin, dental and eye disorders were the leading broader categories. The researchers also noted that Shih Tzus’ short muzzles and relatively exposed eyes can contribute to airway and eye problems (VetCompass study).

Practical care includes:

• Teeth: Brush with dog-safe products if your dog tolerates it, and follow your veterinarian’s dental examination and cleaning plan. Arrange an appointment for bleeding gums, dropping food, difficulty chewing or persistent bad breath.
• Eyes: Check for new redness, cloudiness, colored discharge, squinting, holding an eye closed or sudden bulging. These signs need prompt assessment rather than a prolonged home trial (VCA Animal Hospitals).
• Breathing: Learn your dog’s usual breathing sounds and exercise tolerance. Shih Tzus are among the breeds affected by brachycephalic obstructive airway syndrome. Cornell recommends maintaining a healthy weight, avoiding excessive heat and humidity, controlling activity and using a harness rather than a neck collar for mildly affected dogs (Cornell University College of Veterinary Medicine). Noisy or difficult breathing should still be discussed with a veterinarian; it should not be dismissed as normal for the breed.
• Routine care: Keep preventive visits, parasite protection and vaccinations on the schedule your veterinarian recommends. Ask when senior examinations and screening should become more frequent for your dog.

Watch, call or go now

Watch and record: Note your dog’s normal appetite, activity, mobility, sleep and breathing. A mild change can be observed briefly if your dog remains comfortable and otherwise behaves normally, but arrange a routine appointment if it persists, returns or gradually progresses.

Call promptly: Seek veterinary advice for a worsening change in appetite, weight, thirst, urination, mobility, behavior or exercise tolerance. Eye redness, cloudiness, discharge, squinting, holding the eye closed or sudden bulging also warrants prompt assessment.

Go now: Transport your Shih Tzu to a veterinarian or emergency hospital for a respiratory crisis, collapse, or severe eye trauma. An eyeball displaced from its socket is also an emergency. Cornell specifically advises immediate transport for a BOAS respiratory crisis, while VCA directs severe eye trauma and displacement of the eyeball to emergency care.

Reaching 12 or 13 does not mean a Shih Tzu is automatically near the end of life, just as being younger does not rule out serious illness. Use the breed estimate for long-term planning—not to explain away a new health change.