Brachycephalic Obstructive Airway Syndrome (BOAS)

RespiratoryCanineNew

Key Points

Brachycephalic obstructive airway syndrome (BOAS) is a disorder caused by the anatomical changes associated with brachycephalic skull conformation
- Results in upper airway obstruction and increased airway resistance
Primary anatomical abnormalities:
- Stenotic nares
- Elongated soft palate
- Tracheal hypoplasia
- Aberrant nasal turbinates
Common clinical signs include stertor, stridor, snoring, exercise intolerance and dyspnoea
Diagnosis is based on clinical presentation and imaging to assess the airway anatomy
Surgical correction of anatomical abnormalities is the most effective treatment but medical management is useful for stabilisation and mild cases
Prevention focuses on responsible breeding and educating owners about abnormal respiratory signs

Differential Diagnoses

Laryngeal paralysis
Tracheal collapse
Laryngeal or pharyngeal mass

Educational content only. This factsheet is for general veterinary education and is not a substitute for professional veterinary advice, diagnosis, or treatment. Not for use in an emergency — contact a veterinarian or emergency service. Full disclaimer →