The eyes are round and dark, which is in contrast to the triangular or slanted composition of their American counterparts. British Golden Retrievers can have a coat colour of any shade of gold or cream; red or mahogany are not permitted. Originally, cream was an unacceptable colour in the UK standard, but the standard was revised in 1936 to include cream. Golden Retrievers require regular grooming and occasional baths. Their coats shed somewhat during the year, but are known to shed profusely twice a year. They also need to have their ears cleaned regularly, or ear infections might occur. While shedding is unavoidable, frequent grooming (daily to weekly) lessens the amount of hair shed by the animal. Severe shedding resulting in bald patches can be indicative of stress or sickness.