BOAS surgery is a set of procedures that open up the airways of flat-faced dog breeds like French Bulldogs, Pugs, and English Bulldogs. BOAS stands for Brachycephalic Obstructive Airway Syndrome, a condition where the shortened skull compresses the soft tissues of the nose, throat, and airway, making it difficult for the dog to breathe normally. Surgery corrects the specific anatomical problems causing the obstruction, and roughly 97.5% of dogs show noticeable improvement in breathing afterward, with most improving within two weeks.
What BOAS Surgery Actually Fixes
BOAS isn’t a single surgery. It’s a combination of up to three procedures performed during one session under general anesthesia, tailored to whichever airway problems your dog has. The three main targets are the nostrils, the soft palate, and the laryngeal saccules (small pockets of tissue near the voice box).
- Stenotic nares correction (widening the nostrils): Many brachycephalic dogs have nostrils that are pinched nearly shut. The surgeon removes a small wedge of tissue from the nostril to widen the opening, either with a scalpel blade or a surgical laser. This is the simplest of the three procedures and makes an immediate, visible difference in how freely air flows through the nose.
- Staphylectomy (shortening the soft palate): The soft palate in flat-faced breeds is often too long and too thick for the shortened skull, so it flops into the airway and blocks airflow. A staphylectomy trims the palate back to an appropriate length. This can be done with scissors and sutures, an electrocautery device, or a CO2 laser.
- Sacculectomy (removing everted laryngeal saccules): When a dog struggles to breathe for months or years, the chronic effort can pull small tissue pockets near the larynx inside out, creating extra obstructions. If these saccules are everted, the surgeon removes them during the same session. This is typically done alongside the other two procedures rather than on its own.
Not every dog needs all three. Your veterinarian will evaluate which structures are causing problems and recommend the combination that fits your dog’s anatomy.
How Vets Decide Surgery Is Needed
Veterinarians use a grading system to assess how severely a dog is affected. The scale runs from Grade 0 (no respiratory signs) to Grade 3 (severe breathing difficulty). Dogs at Grade 0 or 1 are generally monitored rather than operated on, though annual check-ups are recommended for dogs under two years old since the condition can worsen with age. At Grade 2, the disease is clinically significant and the dog may benefit from weight management, surgery, or both. Grade 3 dogs have severe obstruction and are strong candidates for surgical intervention.
The grading is based on observable signs: how much noise the dog makes while breathing, whether exercise tolerance is reduced, and how much effort goes into each breath. Your vet may also use imaging or a direct look at the airway under light sedation to assess the soft palate length and check for saccule eversion or early laryngeal collapse.
Why Earlier Surgery Leads to Better Results
Cornell University’s veterinary college notes that dogs operated on before age two have better outcomes than those treated later. The reason is straightforward: the longer a dog struggles against a partially blocked airway, the more secondary damage accumulates. Everted laryngeal saccules are the first stage of laryngeal collapse, a progressive condition where the cartilage structures of the larynx begin to fold inward. Once collapse progresses beyond that first stage, surgical outcomes become less favorable regardless of what procedures are performed.
Early correction removes the source of chronic strain before these irreversible changes set in. If your puppy is already snoring loudly, gagging regularly, or overheating easily, those are signs worth evaluating sooner rather than later.
Laser vs. Traditional Techniques
The soft palate portion of the surgery can be performed several ways. Traditional sharp resection uses scissors to cut the palate, then sutures to close the wound. CO2 laser and bipolar sealing devices offer an alternative that tends to produce less bleeding, less swelling, and less postoperative pain compared to the scissors-and-sutures approach. Faster procedure times are another advantage, which means less time under anesthesia.
A newer technique called folded flap palatoplasty (FFP) was developed to thin the palate in addition to shortening it. A 2025 study in the Journal of the American Veterinary Medical Association compared FFP to traditional staphylectomy in French Bulldogs and found both techniques produced similar results: significantly shorter, thinner palates with equivalent clinical improvement. So while FFP is a valid option, it doesn’t appear to outperform the traditional approach when combined with the other airway procedures.
Risks and Recovery
The most critical window is the first 24 hours after surgery. The airway tissues swell in response to being cut and manipulated, and in a dog whose airway is already narrow, even mild swelling can cause problems. A study of 199 dogs undergoing BOAS surgery found the following complication rates: low blood oxygen levels in 5% of cases, breathing difficulty requiring the breathing tube to be reinserted in 7%, breathing difficulty severe enough to need a temporary tracheostomy in 5%, and aspiration pneumonia in 6%.
These numbers reflect why most veterinary hospitals keep BOAS patients overnight for close monitoring. The dog will typically have restricted activity for one to two weeks after surgery. Soft food is usually recommended during the initial healing period since the throat tissues need time to recover. Most dogs breathe noticeably better within the first two weeks, though full healing of the surgical sites takes longer.
What BOAS Surgery Costs
Pricing varies significantly by location, the number of procedures performed, and whether a board-certified surgeon or a general practice vet does the work. When all three procedures are needed and performed by a specialist, expect a range of $2,000 to $2,500. If only one or two corrections are required, costs typically fall between $1,000 and $1,500 with a specialist. A general practice veterinarian may charge roughly half those amounts, though complex cases are often better handled by a surgeon experienced in airway work. Adding in pre-surgical imaging or overnight monitoring can add $300 to $500 to the total. Across all variables, the full range runs from about $1,000 to $5,000.
Which Breeds Are Most Affected
French Bulldogs, English Bulldogs, Pugs, Boston Terriers, Shih Tzus, and Pekingese are the breeds most commonly affected. Any dog with a significantly shortened muzzle can develop BOAS, and mixed breeds with brachycephalic ancestry are not exempt. Overweight dogs of these breeds tend to have more severe airway obstruction because extra fat deposits around the throat narrow the airway further. In milder cases, weight loss alone can improve breathing enough to avoid or delay surgery.