West Highland White Terriers most commonly die from lung disease and cancer, each accounting for about 10% of recorded deaths. Spinal cord problems, brain disorders, and gastrointestinal disease round out the next tier. Westies typically live 13 to 15 years, making them a relatively long-lived breed, but they carry genetic predispositions to a few serious conditions that owners should recognize early.
The Leading Causes of Death in Westies
A large UK veterinary study tracking Westies under primary care found that among dogs with a recorded cause of death, the top causes broke down this way:
- Lower respiratory tract disease: 10.2%
- Cancer: 10.2%
- Spinal cord disorders: 7.8%
- Brain disorders: 6.3%
- Behavioral (typically euthanasia for aggression or quality-of-life decline): 6.3%
- Gastrointestinal disease: 6.3%
What stands out is how evenly distributed these causes are. Unlike some breeds where cancer dominates, Westies face a spread of risks across multiple body systems. Lung disease tying with cancer at the top is unusual among dog breeds and reflects a condition that’s nearly unique to Westies.
Westie Lung Disease (Pulmonary Fibrosis)
The lung disease responsible for so many Westie deaths is idiopathic pulmonary fibrosis, sometimes called “Westie lung disease” because the breed is overwhelmingly the most affected. In this condition, the tissue in the lungs gradually scars and stiffens, making it harder and harder to absorb oxygen. It’s incurable.
Pulmonary fibrosis typically appears in older Westies. The median age at diagnosis is around 12 years, with cases ranging from age 8 to 13. Early signs are easy to miss or dismiss as normal aging: a dry cough, reluctance to exercise, faster breathing, and tiring on walks. As the disease progresses, dogs may cough more frequently and struggle to catch their breath even at rest.
After diagnosis, survival varies widely. One study of affected Westies found a median survival of about 11 months from the time of diagnosis, though some dogs lived more than three years post-diagnosis and others declined within weeks. From the first onset of clinical signs, the median survival was roughly 32 months. The disease is managed with medications that reduce inflammation and improve comfort, but it cannot be reversed. If your Westie develops a persistent dry cough in their senior years, this is the condition your vet will likely want to rule out first.
Cancer Risks
Cancer accounts for about 1 in 10 Westie deaths. Westies can develop the same range of cancers as other breeds, but one stands out: bladder cancer, specifically a type called transitional cell carcinoma. Westies are 3 to 5 times more likely to develop this cancer than the average dog.
Bladder cancer tends to cause blood in the urine, frequent urination, straining to urinate, or what looks like recurring urinary tract infections that don’t fully clear up with antibiotics. It’s most common in middle-aged to older dogs. Catching it early gives more treatment options, so unexplained urinary symptoms in a Westie are worth investigating promptly rather than assuming a simple infection.
Spinal Cord and Brain Disorders
Spinal cord problems caused nearly 8% of deaths in the veterinary study, and brain disorders accounted for another 6%. In older small-breed dogs, spinal issues often involve disc disease, where the cushioning discs between vertebrae degenerate or rupture and press on the spinal cord. This can cause pain, wobbliness in the hind legs, or in severe cases, paralysis.
Brain-related causes of death can include seizure disorders, strokes, or age-related cognitive decline severe enough to affect quality of life. Westies are also one of the breeds predisposed to a condition informally called “white shaker syndrome,” which causes full-body tremors. While that condition itself isn’t typically fatal, it reflects the breed’s susceptibility to neurological issues more broadly.
Addison’s Disease
Westies are one of several breeds genetically predisposed to Addison’s disease, a condition where the adrenal glands stop producing enough hormones. These hormones regulate everything from blood pressure to electrolyte balance, so when they’re missing, dogs can become weak, lose their appetite, vomit, and in serious cases collapse suddenly in what’s called an Addisonian crisis.
The tricky part is that early symptoms are vague and come and go. A Westie might seem off for a day or two, then bounce back, then crash again weeks later. Without treatment, Addison’s disease can be fatal. With treatment, though, most dogs live normal lives on daily hormone replacement. The danger is in not recognizing it before a crisis hits, so if your Westie has recurring episodes of unexplained lethargy, vomiting, or weakness, it’s worth asking your vet to test for it.
What Affects How Long a Westie Lives
The 13-to-15-year average lifespan puts Westies in line with other small terrier breeds, and many live well into their teens with good care. The factors that most influence longevity are the ones you’d expect: maintaining a healthy weight, keeping up with dental care (dental disease drives systemic inflammation in older dogs), and staying alert to the breed-specific warning signs outlined above.
Because Westies face such a spread of potential issues rather than one dominant killer, there’s no single screening test that covers everything. Regular veterinary checkups become more valuable as your Westie ages past 8 or 9, since that’s when pulmonary fibrosis, cancer, and spinal problems start showing up. Catching changes in breathing, mobility, or urination habits early is the most practical thing you can do to give your dog the longest, most comfortable life possible.