Well i agree with both marian and marie i have never herd of this happening it will change a little but to the normal person it will go by unnoticed! size will do with genetic and what the person likes! When the breed was young to the world a old breeder told me never breed bully to bully since you will get more bullier and never breed (performance) to (performance) or youll end up with a well boxer type. so they always breed bully to performence to have a dog that looked well oldie. some though continued to breed performance to performance and today desendents of them might look to some one like a boxer but like marian said the conformation is totaly different and the relation are normaly done by thoughs that are not familiar with the breed.