Brachycephalic Obstructive Airway Syndrome (BOAS) is a chronic, progressive upper respiratory disorder in short-nosed breeds (e.g., Pugs, French Bulldogs, Bulldogs) caused by anatomical abnormalities like narrow nostrils and elongated soft palates. Symptoms include loud breathing, snorting, exercise intolerance, vomiting, and heat exhaustion. Treatment often involves surgical airway widening.
Common Symptoms
- Respiratory Distress: Loud, noisy breathing, snoring (even while awake), and increased effort to breathe.
- Exercise Intolerance: Reluctance to play or exercise, tires quickly.
- Heat Sensitivity: Inability to cool down effectively via panting.
- Digestive Issues: Gagging, retching, vomiting, or regurgitation.
- Severe Signs: Cyanosis (blue-colored gums/tongue), collapsing episodes, and fainting.
Causes and Risk Factors
- BOAS is caused by inherited anatomical defects in brachycephalic (flat-faced) breeds:
- Stenotic Nares: Narrow or pinched nostrils that restrict airflow.
- Elongated Soft Palate: The roof of the mouth is too long, partially blocking the throat.
- Everted Laryngeal Saccules: Tissue in the airway is pulled inside out due to high pressure.
- Hypoplastic Trachea: A narrow windpipe, which is common in these breeds.
- Risk Factors: Obesity significantly worsens symptoms.
Treatment and Prognosis
- Surgery: The primary treatment, often including widening the nostrils (stenotic nares resection) and shortening the soft palate.
- Management: Weight management, avoiding hot/humid weather, and using harnesses instead of neck collars.
- Prognosis: If treated early, many dogs have a improved quality of life, but the condition is lifelong and can be progressive, sometimes leading to irreversible laryngeal collapse if left untreated.
Affected Breeds
- Commonly affected breeds include English Bulldogs, French Bulldogs, Pugs, Boston Terriers, Boxers, Pekingese, Shih Tzus, and Lhasa
For more information, please visit the AAHA website.