A Dog's Muzzle Shape Predicts Life Expectancy, Study Says
Notice: this content is for information only and does not replace a visit to the veterinarian. If your pet has symptoms, see a veterinarian before acting on this article.
You watch your French Bulldog snoring loudly on the couch and think it is cute. Everyone does — it becomes a video, a meme. But that constant snoring is not just breed charm. It is a sign of something science has already measured: how long this dog is going to live.
A study published in 2024 followed nearly 600,000 dogs in the United Kingdom, across more than 150 breeds. The conclusion changes the way you look at your dog's muzzle: it is not just size that decides life expectancy. It is skull shape.
What science found about muzzle shape and life expectancy
The research compared brachycephalic dogs — flat-faced ones, such as the Bulldog, Pug and Shih Tzu — with dogs that have medium or long muzzles. The result: a flat muzzle shortens a dog's life by up to 40%.
The numbers, in practice:
- French Bulldogs live an average of 9.8 years.
- Medium-sized brachycephalic dogs fall between 9.1 years (males) and 9.6 years (females).
- Small long-muzzled dogs, such as the Dachshund and Shetland Sheepdog, reach 13.3 years.
- The Border Collie, also long-muzzled, lives 13.1 years.
| Group | Life expectancy |
|---|---|
| French Bulldog (brachycephalic) | 9.8 years |
| Medium-sized brachycephalic, male | 9.1 years |
| Medium-sized brachycephalic, female | 9.6 years |
| Border Collie (long muzzle) | 13.1 years |
| Dachshund and Shetland Sheepdog (long muzzle, small) | up to 13.3 years |
The most striking difference: a medium-sized brachycephalic male has three times the chance of premature death of a small long-muzzled female. It is one of the strongest canine longevity variables ever measured — stronger, in fact, than many people would expect just from looking at the dog's size.
Why does a flat muzzle shorten a dog's life?
The mechanism has a name: BOAS, brachycephalic obstructive airway syndrome (the short skull compresses the dog's respiratory structure). The VCA Animal Hospitals detail the components of this condition, and three problems usually appear together:
- Nasal stenosis — nostrils that are too narrow, so air gets in with difficulty.
- Elongated soft palate — the "roof of the mouth" is too long and blocks part of the throat.
- Everted laryngeal saccules — laryngeal tissue turns inside out and narrows the air passage even further.
The result is a dog that breathes with chronic effort for its whole life. Every breath takes more work than it should, with recurring episodes of low oxygenation — and, over time, a risk of laryngeal or tracheal collapse and frequent regurgitation. It is not fussiness, it is not a "cute snoring dog." It is an airway working at its limit every single day.
Size still counts — but it is not everything
The classic rule still holds: small dogs live longer (15 to 18 years), giant dogs live less (6 to 9 years) — small dogs have lower IGF-1 (a growth-related hormone), and large dogs age faster at the cellular level. But the 2024 study shows that muzzle shape competes with size as a risk factor, sometimes weighing more: a small brachycephalic dog does not automatically inherit "small dog" longevity.
5 care habits that extend the life of a flat-faced dog
Having a Bulldog, Pug or Shih Tzu is not a sentence. It is a routine of extra attention:
- Strict weight control. Every extra pound squeezes an already narrow airway even more — it is the highest-impact care, controlled every day in the amount in the bowl.
- Avoid heat and intense physical effort. A brachycephalic dog regulates body temperature with difficulty. A walk in strong sun or a run can become an emergency — prefer the cool of the morning or late afternoon.
- Harness instead of collar. A collar presses directly on the neck, which is already compromised. A harness takes that pressure off the throat.
- Snoring and choking are not normal — they are a clinical sign. Visible effort to breathe or episodes of choking deserve a veterinary evaluation, not just "that's how he's always been."
- BOAS evaluation with the veterinarian. In indicated cases, there is surgical correction — it widens the nostrils and corrects the soft palate and laryngeal saccules — which greatly improves the dog's quality of life and life expectancy.
What NOT to do
- Do not ignore loud snoring and effort to breathe, thinking "that's just how it is, it's the breed."
- Do not take a brachycephalic dog for walks or exercise during the hottest hours of the day.
- Do not normalize frequent choking during or after meals — it is a sign, not a habit.
Frequently asked questions
Does a flat muzzle always mean a shorter life?
It is not an individual sentence, it is a strong statistical tendency. Weight care, temperature management and veterinary follow-up change the outcome for each dog.
What is BOAS?
It is brachycephalic obstructive airway syndrome — the set of respiratory problems that the flattened skull causes.
Do Bulldogs and Pugs necessarily need surgery?
Not all of them. The indication depends on the severity of the symptoms — the veterinarian evaluates case by case.
Can I tell whether my dog is at risk of BOAS?
Constant snoring, noisy breathing, tiring quickly on walks and choking while eating are warning signs. A veterinary consultation confirms the diagnosis.
Every breed carries its own points of attention — knowing your dog's health history is the first step to caring for him better. Discover the ideal care profile for your dog →
Picked by score from our overall dog ranking, not by the topic of this article. To get it right for your pet — age, weight, spayed or neutered — take the quiz and get a list made for them. A pet with a diagnosed condition needs a diet prescribed by a veterinarian.
