New health screening scheme launched to improve health of Pugs, French Bulldogs and Bulldogs


Developed by the University of Cambridge and funded by the Kennel Club Charitable Trust, the new Respiratory Function Grading Scheme assesses dogs for the presence and severity of a breathing problem known as BOAS (Brachycephalic Obstructive Airway Syndrome).

The scheme is currently available for any Pug, French Bulldog and Bulldog, and has the potential to improve the health and welfare of these breeds for generations to come. The scheme provides breeders with a means to know more about the health of their dogs, giving them the information they need to reduce the risk of breeding puppies with BOAS.

The scheme’s launch, which took place at the University of Cambridge, saw presentations from the leading BOAS researchers and vets, and Kennel Club breed and genetics experts, to guests from across the canine health and welfare spectrum. It provided the opportunity to develop a better understanding of the process behind the scheme, including a demonstration carried out by Chief Assessor Dr Jane Ladlow, who has been leading the BOAS research and development of the scheme at the University of Cambridge.

The assessment, which can now be carried out by a number of specially-trained assessors located across the UK, involves listening to the dog’s airway both before and after an exercise tolerance test. Assessors, who are all specially-trained BOAS vets, then use a pre-defined protocol to grade the dog from zero to three. Dogs graded as zero will be free of respiratory signs of BOAS, while dogs graded as three will show severe respiratory signs of BOAS, indicating that further veterinary examination is advised. The scheme issues guidance that dogs graded three should not be bred from.

For Kennel Club registered dogs, these grades will be recorded on the Kennel Club’s database and published in the Breed Records Supplement, on the dog’s registration certificate, and on the Kennel Club Health Test Results Finder and Health webpages. The BOAS scheme will be supported by guidelines for breeders, which enable them to understand the grade for their dogs in terms of risk when considering potential matings.

Dr Jane Ladlow, MA VetMB CertVR CertSAS DipECVS MRCVS, Royal College and European Specialist in Small Animal Surgery at the University of Cambridge, said: “The way that BOAS is inherited is very complex and so not always entirely predictable. We are researching the genetics of this condition but it is likely to take a few years before we have a viable genetics test. We have realised over the last few years how useful the functional grading scheme is in determining disease severity and it reflects the initial genetic data we have. The scheme is a vital tool to help advise all owners if their dog is affected by BOAS and gives guidance to breeders to lower the risk of producing affected puppies. It also, crucially, facilitates important data collection and enables researchers to monitor the frequency of the condition and progress in the breed affected, which will inform ongoing research, for the overall improvement of relevant breeds.

“We look forward to working with the Kennel Club and other collaborative parties dedicated to improving brachycephalic dog health across the board through promoting the scheme and engaging vets, breeders and puppy-buyers to raise awareness and understanding of this complex Syndrome.”

For more details on the scheme please see the Kennel Club website and the BOAS research group website at:

Image: From left, Dr Jane Ladlow, Andrew Higgins of the Kennel Club Charitable Trust, Dr David Sargan, Dr Nai-Chieh Liu and Hector Heathcote of the Kennel Club Board. Credit The Kennel Club and Heidi Hudson