BOAS surgery is a set of procedures that open up the airways of flat-faced (brachycephalic) dogs like Bulldogs, Pugs, and French Bulldogs. These breeds are born with compressed skulls that crowd their airways, making it harder to breathe. Surgery corrects the specific anatomical problems causing obstruction, and 94% of owners in follow-up studies report it improved their dog’s quality of life.
What BOAS Actually Is
Brachycephalic Obstructive Airway Syndrome is a collection of structural problems in the nose, throat, and airway that develop because the skull has been bred shorter while the soft tissue inside hasn’t shrunk to match. The most common abnormalities are narrowed nostrils (stenotic nares), an elongated and thickened soft palate that blocks the throat opening, overgrown tissue inside the nasal passages (aberrant turbinates), an oversized tongue, and sometimes a windpipe that’s too narrow for the dog’s body size.
These problems don’t exist in isolation. A dog struggling to pull air through pinched nostrils creates stronger negative pressure in the throat, which over time causes secondary changes: the tissue lining the voice box gets sucked inward (everted laryngeal saccules), the airway walls weaken, and the soft palate swells further. This is why vets often recommend surgery before the condition spirals into more severe obstruction.
How Vets Decide a Dog Needs Surgery
BOAS is graded on a 0 to 3 scale based on how much noise and respiratory effort a dog shows before and after exercise. Grade 0 means no signs, grade 1 is mild, grade 2 is moderate, and grade 3 is severe. Dogs graded at 2 or 3 are considered clinically affected and are the strongest candidates for surgical correction. Signs that push a dog into these higher grades include loud snoring while awake, gagging or retching regularly, exercise intolerance, overheating easily, and episodes where the dog visibly struggles to get air.
What the Surgery Involves
BOAS surgery isn’t a single operation. It’s a combination of procedures tailored to whichever abnormalities your dog has. Most dogs need at least two of these corrections done in the same session.
Nostril Widening (Rhinoplasty)
For dogs with pinched nostrils, the surgeon removes a wedge-shaped piece of tissue from each nostril to open the airway. The most common approach is a pyramidal wedge resection, where two angled cuts remove a small triangle of cartilage and skin, then the edges are sutured closed. This is often the simplest part of the surgery but can make a significant difference on its own, since the nostrils are where airflow begins.
Soft Palate Shortening (Staphylectomy)
This is the centerpiece of most BOAS surgeries. The soft palate, the fleshy flap at the back of the roof of the mouth, hangs too far down in brachycephalic dogs and blocks the entrance to the windpipe. The surgeon trims it back so it no longer covers the epiglottis. Traditional techniques cut the excess tissue and stitch the oral and nasal surfaces together at the new edge. Surgeons may use an electroscalpel, radiofrequency device, CO2 laser, or conventional blade for this step.
A newer variation called folded flap palatoplasty goes further by thinning the palate’s muscle layer in addition to shortening it. This addresses thickness, not just length, which matters because the palate in affected dogs is often swollen and bulky. Evidence directly comparing it to traditional resection is still limited, but the technique is gaining traction at specialty centers.
Laryngeal Saccule Removal (Sacculectomy)
If the tissue pouches just inside the voice box have been pulled inward by chronic airway pressure, the surgeon may remove them to clear additional space. Not every dog needs this step. It’s typically added when everted saccules are visible during the procedure.
Laser vs. Traditional Scalpel
CO2 laser surgery has become increasingly popular for BOAS procedures. Compared to conventional scalpel work, laser surgery results in shorter operating times, less bleeding (it seals blood vessels smaller than 0.5 mm on contact), and lower pain scores in the first 24 hours. Dogs operated on with a laser ate their first meal about 8 hours after surgery on average, compared to 12 hours for scalpel patients. Healing time is also shorter, and scar tissue tends to be softer and less prominent.
The tradeoff is cost. Laser equipment is expensive, and clinics that offer it typically charge more. Some veterinarians who stick with traditional techniques cite the price difference as the main reason, not clinical outcomes.
What Recovery Looks Like
Breathing improvement is often noticeable within 24 to 48 hours. Most dogs have audibly quieter breathing right away, though swelling continues to decrease over about two weeks. Expect some blood around the nostrils and mouth in the first day, and don’t be alarmed by retching, small vomits, or excessive swallowing during the first five to seven days. The throat is sore, and these reflexes are normal.
For the first two weeks, your dog should eat only soft food. No hard kibble, bones, or tough chew toys. Activity needs to stay minimal: no running, jumping, or rough play with other dogs. Keep the environment cool, since brachycephalic dogs are already prone to overheating and post-surgical swelling temporarily narrows the airway further. A recheck appointment is typically scheduled five to seven days after surgery, and if everything looks good at two weeks, you can transition back to a normal diet and activity level.
Some vets recommend overnight observation at an emergency facility immediately after surgery, since the first 12 to 24 hours carry the highest risk of airway swelling. If your dog appears to be struggling to breathe at any point during recovery, that warrants an emergency visit.
Risks and Complications
BOAS surgery is common and generally well tolerated, but it isn’t risk-free. In a study of 55 dogs, the overall major complication rate was 7%. The most common issues were vomiting or regurgitation of mucus (affecting about 24% of dogs), aspiration pneumonia (11%), and nasal discharge (5%). A small percentage of dogs, around 3% to 5%, needed a temporary tracheostomy tube placed to keep the airway open while swelling resolved. Severe breathing distress or death occurred in 3% to 5% of cases across published studies.
Dogs with more severe disease going into surgery, particularly those with secondary airway changes already in place, face higher complication rates. This is one reason many vets advocate for earlier intervention rather than waiting until the condition has progressed.
Long-Term Results
The outlook after BOAS surgery is encouraging. In owner surveys, 55% of owners said their dog no longer had any breathing issues after surgery, and 97% said they would recommend the procedure to other owners of brachycephalic dogs. These results reflect multi-level surgery, meaning correction of both the nostrils and the soft palate in the same session. Dogs that only have one component addressed may see less dramatic improvement.
It’s worth noting that surgery doesn’t make a brachycephalic dog breathe like a long-nosed breed. The skull structure is still compressed, and some degree of airway compromise remains. But for dogs that were previously gasping, overheating on short walks, or unable to sleep without snoring loudly enough to wake the household, the difference can be transformative.
Cost of BOAS Surgery
Full corrective surgery typically costs between $2,000 and $5,000, with the core day-of-surgery expense falling in the $2,500 to $3,500 range for most Bulldogs and Pugs. If your dog only needs nostril correction, costs may start around $800. Less complex cases treated at smaller clinics might run $1,000 to $3,000. Particularly involved cases requiring advanced techniques or extended hospitalization can push close to $5,000.
Location matters. Specialty hospitals in major cities charge more due to overhead and access to equipment like CO2 lasers. Smaller practices may be more affordable but don’t always have the same surgical expertise. If your dog is a candidate for BOAS surgery, asking for a referral to a board-certified veterinary surgeon is reasonable, especially for moderate to severe cases where precision makes a measurable difference in outcome.