American Staffordshire Terrier (IMAGE) University of Helsinki Caption According to the study tail abnormalities in the American Staffordshire Terriers were less severe than the screw tails typically seen in English Bulldogs, French Bulldogs and Boston Terriers. Credit YVONNE LÜNEBURGER/PIXABAY Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.