British Golden Retrievers can have a coat colour of any shade of gold or cream; red or mahogany are not permitted. American types are lankier and less muscular than other types, males stand between 23 and 24 in (58 and 61 cm) in height at the withers; females are 21.5 to 22.5 in (55 to 57 cm) tall. Their coats are darker in colour and occur in various shades of lustrous gold with moderate feathering. When trotting, they have a free, smooth, powerful, and well-coordinated gait; as the dog runs, its feet converge towards the center of the line of balance. American breeders of Golden Retrievers sometimes import their dogs from Britain to take advantage of the temperament and appearance of the British types. Golden Retrievers require regular grooming and occasional baths. Their coats shed somewhat during the year, but are known to shed profusely twice a year.