Dogs are more commonly affected than cats. In particular brachycephalic breeds are more commonly affected due to the intra-uterine growth characteristics of the skull. Other at risk [[Canine Breeds - WikiNormals| dog breeds]] include, Boston terriers, Pekingese, minature schnauzers, beagles and cocker spaniels. | Dogs are more commonly affected than cats. In particular brachycephalic breeds are more commonly affected due to the intra-uterine growth characteristics of the skull. Other at risk [[Canine Breeds - WikiNormals| dog breeds]] include, Boston terriers, Pekingese, minature schnauzers, beagles and cocker spaniels. |