And while age plays a major factor, some dogs may start showing signs of graying at just 2 years old. Stress and anxiety can also contribute to premature aging, Batteiger said. The conversation was ...

The Shetland Sheepdog, or Sheltie, is a beautiful dog breed with a long, luscious coat. They have harsh, straight fur with a dense undercoat underneath that comes in a variety of gorgeous colors.