The skull photos to the right from the Natural History Museum in Bern show how the bulldog for example has become more
severely brachycephalic over the last 50 years.
But all moderately or
severely brachycephalic dogs have some degree of health impairment, compared with dogs that have normal facial bones.
As such,
severely brachycephalic cats should not be bred from and every attempt should be made to breed cats with a conformation that is not detrimental to their health.
The Pekinese and the Pugs are two examples of
severely brachycephalic dogs and have a number of health problems as a result.