The Cambridge BOAS test (Cambridge Brachycephalic Obstructive Airway Syndrome Functional Grading Scheme) is a standardized assessment developed by researchers at the University of Cambridge to objectively evaluate breathing difficulties in brachycephalic breeds such as French Bulldogs, Pugs, and Bulldogs.
In short, the test works as follows:
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The dog first undergoes a clinical examination (assessment of nostrils, soft palate, airway sounds, and general respiratory function).
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This is followed by a controlled exercise challenge—usually a 3-minute brisk walk or light trot.
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After exercise, the veterinarian performs a post-exercise respiratory evaluation, listening for abnormal sounds such as stertor, stridor, or signs of respiratory distress.
Dogs are then classified into four grades (0–3):
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Grade 0 – no clinical signs of BOAS
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Grade 1 – mild signs, minimal impact on quality of life
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Grade 2 – moderate signs; clinical intervention recommended
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Grade 3 – severe BOAS; the dog is significantly affected and typically requires surgical treatment
The strength of the Cambridge BOAS test lies in its objective and reproducible scoring, making it valuable for owners, veterinarians, and breeders!

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