Overview

• Scientists from Cornell University and Washington University documented unprecedented cranial convergence between certain dog and cat breeds, such as pugs and Persian cats.
• The study used three-dimensional CT scans from veterinary clinics, museums, and digital archives to analyze skull morphology across domestic and wild species.
• Parallel evolution of brachycephalic traits was observed multiple times within both species, including bulldogs and Pekingese in dogs, and Persian and Himalayan cats.
• Domestic dogs and cats now exhibit greater cranial diversity than their respective broader taxonomic groups, highlighting the rapid impact of artificial selection.
• Extreme breeding for flattened faces has led to significant health issues, including respiratory, dental, and birthing problems, prompting ethical concerns over these practices.