Flat-faced pets have become incredibly popular over the last decade. Breeds like the French Bulldog, English Bulldog, Pug, and Persian-type cats are beloved for their expressive faces and affectionate personalities. But behind those adorable features, many of these pets struggle with a serious medical condition called Brachycephalic Obstructive Airway Syndrome (BOAS).
At Boundary Bay Veterinary Specialty Hospital, our board-certified Surgery and Critical Care teams regularly evaluate and treat pets with airway disease. Many owners are surprised to learn that the “normal” sounds their pet makes—snoring, snorting, noisy breathing, or exercise intolerance—are often signs of chronic respiratory distress rather than harmless breed traits.
What Is BOAS?
BOAS is a collection of airway abnormalities commonly seen in flat-faced breeds. These pets are born with shortened skulls, but the soft tissues inside the nose and throat often do not shrink proportionally. The result is overcrowding within the airway.
Common airway abnormalities include:
- Narrow nostrils (called stenotic nares)
- An elongated or overly thick soft palate (the soft tissue at the back of the roof of the mouth)
- Enlarged tongue tissue
- A narrowed windpipe (hypoplastic trachea)
- Collapse of structures within the throat or voice box (larynx)
- Excess tissue inside the nasal cavity
BOAS is not simply a cosmetic issue—it is a progressive breathing disorder. Over time, the constant effort required to move air through a narrowed airway creates chronic inflammation, swelling, and increasing airway collapse.
Signs Your Pet May Be Struggling to Breathe
Many owners assume noisy breathing is simply “part of the breed.” In reality, these signs often indicate significant airway obstruction.
Watch for:
- Loud snoring while awake or asleep
- Snorting or gagging sounds
- Laboured breathing
- Exercise intolerance
- Difficulty cooling down after activity
- Heat intolerance
- Sleeping with the neck extended
- Restlessness during sleep
- Blue gums or collapse episodes in severe cases
One of the most important things specialists see with BOAS patients is that many pets quietly adapt to chronic breathing difficulty over time. Because these signs develop gradually, families often don’t realize how hard their pet is working just to breathe normally.
BOAS Can Also Affect the Digestive System
A detail many pet owners do not realize is that BOAS can affect far more than breathing. The abnormal pressure created while struggling to inhale can also impact the esophagus and stomach.
Some pets develop:
- Regurgitation (passive bringing up of food or water)
- Vomiting
- Excessive drooling
- Lip smacking
- Difficulty swallowing
- Acid reflux symptoms
In some cases, pets may even develop a hiatal hernia, where part of the stomach slips into the chest cavity.
In some brachycephalic pets, food and fluid can move more slowly through the esophagus, allowing stomach contents to reflux back upward. These gastrointestinal issues can increase the risk of complications such as aspiration during anesthesia, which is why careful anesthetic planning and monitoring are especially important for BOAS patients.
Why Early Treatment Matters
Because BOAS often worsens over time, early treatment can make a significant difference in a pet’s long-term comfort and quality of life.
Veterinary studies have demonstrated that airway surgery not only improves day-to-day breathing and comfort in brachycephalic pets, but can also reduce the risk of complications during future anesthetic procedures.
Many owners report improvements in:
- Breathing comfort
- Sleep quality
- Exercise tolerance
- Ability to tolerate warm weather
- Energy levels
- Overall quality of life
What Does BOAS Surgery Involve?
Every patient is different, and treatment plans are tailored to the individual pet. Surgery may involve one or several procedures to improve airflow.
Widening the Nostrils
Pets with narrowed nostrils often benefit from surgery to enlarge the nasal openings and reduce resistance when breathing.
Soft Palate Surgery
Many flat-faced pets have an elongated or thickened soft palate that partially blocks the airway. Surgery shortens and reshapes this tissue to allow air to move more freely through the throat.
Removal of Everted Laryngeal Saccules
In some dogs, small tissue pockets inside the voice box become pulled into the airway because of chronic negative pressure created while breathing. Removing these tissues can improve airflow.
Advanced Airway Support
More severe patients may require additional support during recovery, including temporary tracheostomy tubes. A tracheostomy creates a temporary airway opening in the neck so the pet can breathe more comfortably while post-surgical swelling improves.
Why BOAS Surgery Requires Specialized Care
One of the most important aspects of BOAS treatment is recognizing that the highest-risk period is often not the surgery itself, but the recovery afterward.
Swelling, airway obstruction, reflux, and aspiration pneumonia (lung infection caused by inhaling stomach contents) can develop rapidly in some patients. Because of this, successful BOAS treatment depends not only on surgical skill, but also on having the facilities, monitoring equipment, and trained personnel needed to manage complications if they occur.
At Boundary Bay Veterinary Specialty Hospital, brachycephalic airway patients benefit from:
- Board-certified surgical expertise
- 24/7 emergency and ICU support
- Advanced anesthesia monitoring
- Highly trained anesthesia and ICU technicians
- Collaboration between Surgery, Emergency, Critical Care, and Internal Medicine teams
Our hospital is also VECCS Level I certified, reflecting the highest level of veterinary emergency and critical care capability.
What About Flat-Faced Cats?
Although less commonly discussed, brachycephalic cats can also suffer from airway obstruction. Persian and Exotic Shorthair cats may develop severely narrowed nostrils that make breathing difficult.
Unlike dogs, cats are usually affected primarily by narrowed nostrils rather than the full combination of airway abnormalities commonly seen in canine BOAS patients.
Surgical techniques for brachycephalic cats continue to evolve, and many feline patients experience meaningful improvement in breathing comfort and airflow after treatment.
When Should You Seek a Referral?
If your pet:
- Snores heavily
- Struggles with exercise
- Overheats easily
- Has noisy breathing
- Experiences regurgitation or reflux
- Seems unable to settle comfortably while sleeping
…it may be time for an airway evaluation.
Early intervention often provides the best long-term outcomes before severe secondary airway collapse develops. You can ask for a referral to our surgical team through your family veterinarian, or contact us directly.
Helping Flat-Faced Pets Breathe Easier
Flat-faced breeds can live happy, comfortable lives—but they should not have to struggle for every breath. Many owners are amazed by the improvement they see after treatment: quieter breathing, better stamina, deeper sleep, and a more active, comfortable pet.
If you are concerned your dog or cat may be affected by BOAS, the Surgery team at Boundary Bay Veterinary Specialty Hospital is happy to work with your family veterinarian to determine the best next steps for your pet.
Is snoring normal for flat-faced dogs and cats?
Not always. At Boundary Bay Veterinary Specialty Hospital, our surgery and critical care teams often find that snoring, snorting, noisy breathing, and exercise intolerance are signs of Brachycephalic Obstructive Airway Syndrome (BOAS) rather than harmless breed characteristics.
What is Brachycephalic Obstructive Airway Syndrome (BOAS)?
BOAS is a progressive breathing disorder caused by multiple structural abnormalities that narrow the airway in flat-faced breeds. Common abnormalities include narrowed nostrils, an elongated or thickened soft palate, enlarged tongue tissue, a narrowed windpipe, collapse of structures within the larynx, and excess tissue inside the nasal cavity.
Which pets are most commonly affected by BOAS?
According to the specialists at Boundary Bay Veterinary Specialty Hospital, BOAS commonly affects flat-faced breeds such as French Bulldogs, English Bulldogs, Pugs, and Persian-type cats.
How can I tell if my pet is struggling to breathe?
Signs of BOAS may include loud snoring while awake or asleep, snorting, gagging, laboured breathing, exercise intolerance, difficulty cooling down after activity, heat intolerance, sleeping with the neck extended, restless sleep, and, in severe cases, blue gums or collapse.
Why do many owners not realize their pet has BOAS?
Because the signs often develop gradually, many brachycephalic pets adapt to chronic breathing difficulty over time. Owners may assume noisy breathing is simply a normal characteristic of the breed, when it can actually indicate chronic airway obstruction.
Can BOAS affect more than my pet’s breathing?
Yes. At Boundary Bay Veterinary Specialty Hospital, we recognize that BOAS can also affect the digestive system. Some pets develop regurgitation, vomiting, excessive drooling, lip smacking, difficulty swallowing, acid reflux, or even a hiatal hernia as a result of chronic airway obstruction.
Why is anesthesia more complicated for pets with BOAS?
The abnormal pressure created during breathing can contribute to reflux and increase the risk of aspiration during anesthesia. Careful anesthetic planning, advanced monitoring, and specialized recovery care are especially important for brachycephalic patients.
Why is early treatment for BOAS important?
Because BOAS is progressive, early treatment may improve long-term breathing comfort and quality of life. The article also notes that airway surgery may reduce the risk of complications during future anesthetic procedures.
What improvements can owners expect after BOAS surgery?
Many owners report quieter breathing, improved sleep quality, better exercise tolerance, greater ability to tolerate warm weather, increased energy levels, and an overall improvement in their pet’s quality of life.
What surgical procedures are used to treat BOAS?
Treatment is tailored to each patient and may include widening narrowed nostrils, shortening and reshaping an elongated soft palate, removing everted laryngeal saccules, or providing temporary airway support with a tracheostomy tube in more severe cases.
Why does BOAS surgery require specialized care?
At Boundary Bay Veterinary Specialty Hospital, successful BOAS treatment involves more than surgery alone. Because swelling, airway obstruction, reflux, and aspiration pneumonia can develop during recovery, patients benefit from advanced anesthesia monitoring, ICU support, and collaboration between surgery, emergency, critical care, and internal medicine teams.
What specialized care does Boundary Bay Veterinary Specialty Hospital provide for pets with BOAS?
BOAS patients receive care from board-certified surgeons with access to 24/7 emergency and intensive care support, advanced anesthesia monitoring, highly trained anesthesia and ICU technicians, and a collaborative team approach. Our hospital is also VECCS Level I certified, reflecting the highest level of veterinary emergency and critical care capability.
Can flat-faced cats develop airway disease?
Yes. Persian and Exotic Shorthair cats can also develop airway obstruction. Unlike dogs, they are more commonly affected by severely narrowed nostrils, and many experience improved breathing comfort following surgical treatment.
When should my pet be referred for a BOAS evaluation?
Boundary Bay Veterinary Specialty Hospital recommends considering an airway evaluation if your pet snores heavily, has noisy breathing, struggles with exercise, overheats easily, experiences regurgitation or reflux, or seems unable to rest comfortably. Early evaluation often provides the best opportunity to improve long-term breathing before more severe airway changes develop.
