The American version can have hip dysplasia problems too, you want to buy from OFA certified stock if there's any doubt. Responsible breeders have their breeding stock certified, big red flag if they don't.

Orthopedic Foundation for Animals

You can get aggressive American Britts too, caution in buying from field trial lines.


The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.