Mutation Makes Bulldogs and Norwich Terriers More Susceptible to Breathing Problems (image) PLOS Share Print E-Mail Caption Isabel, a Norwich Terrier, standing on a rocky outcropping in Beavertail Wildlife Refuge (Rhode Island, USA). Breeds including the Norwich Terrier are predisposed to developing upper airway disease. Credit Marcia A. Sessions Usage Restrictions CC-BY: Redistribution allowed with credit. Share Print E-Mail 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.