Serious diseases can affect the Leonberger—certain types of cancers are very common in the breed. Gastric dilatation volvulus, commonly called bloat, is another serious condition that affects many of the large- and giant-breed dogs, particularly those with deep chests. It causes the stomach to twist and can be fatal quite quickly. Adult Leonbergers should always be fed twice a day rather than one large meal to reduce the likelihood of bloat. Leonbergers are not alone in inheriting serious diseases, and according to the University of Sydney's LIDA taskforce, Leonbergers have relatively few health issues compared to other dog breeds.