CT Measurement Shows Two BOAS Surgeries Shrink the Bulldog Soft Palate Differently
In brachycephalic dogs with brachycephalic obstructive airway syndrome (BOAS), the soft palate is not just long; it can also be thick enough to worsen upper airway crowding in more than one direction. This prospective study used computed tomography before surgery and again four weeks later to compare two common procedures in French bulldogs and English bulldogs: staphylectomy and folded flap palatoplasty, or FFP.
The question was narrowly anatomical, but the clinical stakes are practical. When a dog’s soft palate narrows the nasopharynx and also encroaches on the laryngeal inlet, a surgeon is no longer dealing with length alone. Tissue bulk becomes part of the obstruction, and the choice of operation can determine whether the palate is simply shorter or genuinely less obstructive in three dimensions.
Shortening Was Similar, but Thinning Favored Folded Flap Palatoplasty
Eight dogs underwent staphylectomy and eight underwent FFP. Within each group, both procedures produced a measurable reduction in soft palate length and soft palate volume. After staphylectomy, mean length decreased by 0.91 cm, with a 95% confidence interval from 0.44 to 1.39 cm, and mean volume decreased by 2.81 cm3, with a 95% confidence interval from 1.36 to 4.27 cm3. After FFP, mean length decreased by 0.86 cm, with a 95% confidence interval from 0.39 to 1.33 cm, and mean volume decreased by 2.54 cm3, with a 95% confidence interval from 0.84 to 4.24 cm3.
The two procedures did not separate on the primary shortening outcome. The adjusted mean difference in soft palate shortening between groups was 0.01 cm, with a 95% confidence interval from −0.33 to 0.35 cm. Volume reduction also looked similar between groups, with an adjusted mean difference of 0.32 cm3 and a 95% confidence interval from −0.52 to 1.16 cm3.
One sentence captures the key divergence. Folded flap palatoplasty thinned the soft palate; staphylectomy did not.
In the FFP group, mean soft palate thickness fell by 0.30 cm, with a 95% confidence interval from 0.10 to 0.50 cm. That mattered because BOAS is not only a problem of excess length at the caudal palate. A thickened soft palate can further block the rima glottidis and compound nasopharyngeal obstruction, so a procedure that trims length without reducing bulk may leave a residual mechanical burden behind.
Why Thickness Matters in a Crowded Brachycephalic Airway
The biologic logic is straightforward. In BOAS, narrowed upper airway anatomy creates excess negative inspiratory pressure, and that pressure can drive secondary changes such as soft palate thickening, tonsillar hyperplasia, everted laryngeal saccules, and laryngeal collapse. The soft palate becomes both a primary lesion and a reactive one, so surgery has to address more than a single dimension if it is expected to meaningfully reduce airflow resistance.
Staphylectomy remains the conventional operation for shortening the caudal soft palate. Its appeal is simplicity: resect the redundant distal tissue, restore a more normal length, and reduce caudal encroachment on the laryngeal inlet. FFP was designed with a broader target in mind. By aiming to shorten and thin the palate at the same time, the technique is meant to reduce obstruction at both the glottic and nasopharyngeal levels.
The findings fit that rationale. Both procedures accomplished the shortening that surgeons expect from palatal surgery, but only FFP produced a measurable reduction in thickness. In dogs whose palates are both elongated and bulky, that extra effect may be the deciding factor when the airway remains crowded despite adequate length correction.
What the Four-Week CT Window Can and Cannot Tell Surgeons
The study followed dogs through preoperative and 4-week postoperative CT scanning, so the imaging captured early anatomic change rather than long-term functional recovery. That is useful because it isolates the geometric effect of the operation before later remodeling or progressive disease obscures the picture. It also means the data speak to postoperative anatomy, not to every clinical endpoint that matters to owners, including exercise tolerance, respiratory noise, aspiration risk, or future progression of BOAS.
Even so, the anatomic signal is hard to ignore. In a condition where small airway changes can have outsized physiologic consequences, a third of a centimeter of thickness reduction may be clinically relevant if the soft palate is a major part of the obstruction. The study also reinforces a common surgical principle in brachycephalic airway disease: successful treatment often depends on addressing several lesions at once rather than assuming one resection will solve all of the airflow problem.
A Narrower Surgical Choice for Dogs With Thickened Palates
The dogs in this cohort were French bulldogs and English bulldogs, the breeds most closely associated with severe brachycephalic conformation and upper airway crowding. In that context, the result gives surgeons a more specific way to think about palatal management. If the palate is elongated but not especially thick, staphylectomy may achieve the needed shortening. If the palate is both long and thick, FFP offers a more complete anatomic correction.
The sample remained small, with eight dogs in each surgical group, and the analysis was centered on CT-based morphology rather than longer-term clinical response. Those constraints limit how broadly the results should be generalized across all brachycephalic dogs and all BOAS phenotypes. Still, the prospective design and paired preoperative and postoperative imaging make the anatomic findings direct and clinically relevant.
What the data do not answer is whether the greater thinning seen with FFP translates into superior breathing scores, fewer respiratory crises, or fewer additional surgeries over time. Those outcomes would require a different study design and a longer follow-up horizon. For now, the strongest conclusion is anatomical: both operations shorten and reduce the volume of the bulldog soft palate, but only folded flap palatoplasty reliably reduces thickness as well.