#7 Hormonal changes also affect the color.
Females in heat are lighter and darker again after their season. Grooming a long-haired Yorkshire Terrier is something for the advanced and daring, especially if they have a 'soft' coat that tends to become matted rather than silky!
#8 Even if you keep his coat trimmed short, still brush him daily to prevent tangles and keep him clean.
Small breeds are prone to dental problems and Yorkies are no exception.