New Peer-Reviewed Cambridge Study Highlights the Importance of Objective Health AssessmentStichting Welzijn voor de Hond

Recently, a new scientific study was published by Dr. Joanna Jadwiga Ilska, Fern McDonnell, and Prof. Jane Frances Ladlow, researchers affiliated with the University of Cambridge, the Royal Kennel Club, and international research partners.

The study, “Quantitative genetic analysis of respiratory function and related traits in Bulldogs, French Bulldogs and Pugs,” was published in the scientific journal PLOS ONE and is peer reviewed. This means that independent scientists who were not involved in the research critically evaluated the study beforehand for quality and scientific validity.

We invite everyone with an interest in canine welfare, breeding policy, and responsible dog ownership to take note of this research and the scientific insights it provides. Meaningful public and policy discussions begin with a shared understanding of the facts.

The full study can be read here: PLOS ONE study

What this research shows

The researchers analyzed data from more than 4,000 Bulldogs, French Bulldogs, and Pugs.

Key findings:

• respiratory function appears to be partly influenced by genetics;

• narrowed nostrils also show a hereditary component;

• respiratory problems result from a combination of factors, not from a single physical characteristic;

• objective functional assessment is essential for accurately determining health status.

The study used the Respiratory Function Grading Scheme (RFGS), a standardized method that evaluates a dog’s actual respiratory function, also known as the Cambridge BOAS Test.

In addition to analysis, the researchers also provide practical recommendations for responsible breeding policies aimed at reducing health risks in future generations.

Our message

Stichting Welzijn voor de Hond fully supports the principle that only healthy dogs should be bred. Our goal is not to lower health standards, but to make health policies more effective and scientifically precise.

A physical characteristic alone does not provide sufficient insight into the actual health of an individual dog. That is why we believe policies should not be based solely on morphological traits, but on demonstrable health and objective functional assessment.

This also aligns with broader European developments toward stricter regulations on animal welfare, responsible breeding, and the reduction of hereditary health problems.

We advocate for an approach in which functional health is central, supported by objective testing, health data, and responsible population management.

Not less ambition for animal welfare — but greater precision.