But the Folds were sold in America . The breed kept on growing using crosses with British Shorthairs and American Shorthairs . The breed was not accepted for showing in Europe and the GCCF withdrew registrations in 1971 due to concerns about genetic difficulties and ear problems such as infection , mites , and deafness , but the Folds were exported to America and the breed continued to be established using crosses with British Shorthairs and American Shorthairs .