The Golden Retriever is a medium-large gun dog that was bred to retrieve shot waterfowl, such as ducks and upland game birds, during hunting and shooting parties. The topcoat is water-resistant and slightly wavy, and sheds in small amounts throughout the year. The undercoat is soft and keeps the retriever cool in summer and warm in winter; it sheds in the spring and fall. It usually lies flat against the belly. The Golden's coat should never be too long, as this may prove to be a disservice to it in the field, especially when retrieving game. Other characteristics related to their hunting heritage are a size suited for scrambling in and out of boats and an inordinate love for water. Golden Retrievers are exceptionally trainable—due to their intelligence, athleticism and desire to please their handlers—and excel in obedience trials.