Yorkies have a single layer of fine, silky hair without a dense undercoat. More similar to human hair than coarse fur, their coat grows continuously without seasonal shedding. While their shed hair will not get trapped in an undercoat, they do require regular brushing and grooming to maintain and prevent matting. However, because they lack an insulating undercoat, Yorkies may be more sensitive to cold weather. At Lillian Ruff, we formulate human-grade, plant-based dog shampoo for single-coated dogs, like Yorkies.