Dogs Under Veterinary Care in Hong Kong (2004–2023): Demographic Changes and Implications of Skull Conformation on Veterinary Service Use

Brachycephalic dogs commonly suffer from breathing difficulties and other chronic health problems, yet strong consumer demand is widely reported. Whether the popularity of brachycephalic breeds persists across different contexts is largely untested. Census data from 1,510,085 canine consultations conducted at a single veterinary hospital from 2004 to 2023 in Hong Kong were collected and analysed. Individual dogs (n = 96,777) were counted once, in the first year of presentation. Males (53.5% to 57.7%) and purebreds (86.2% to 91.2%) predominated each year. Neutered dogs increased from 52% to 70% annually. Poodles were the most popular breed from 2009. Brachycephalic breeds, collectively, declined progressively from 36.3% to 15.4% of the annual population. This trend was exaggerated in dogs < 1-year-old (27.4% to 11.7%). Absolute numbers of common brachycephalic breeds declined, except for French Bulldogs and Pugs. A historical cohort study was conducted with a subset of the data (2016–2023) to investigate the hypothesis that veterinary service use would be higher in brachycephalic breeds compared with other groups. The hypothesis was proven. Relative demand for brachycephalic breeds in Hong Kong is decreasing, with the exception of French Bulldogs and Pugs. Investigating drivers of these observations will inform behaviour change strategies, and facilitate comparisons across different regions.