The
coat of the domestic dog (
Canis lupus familiaris) refers to the
hair that covers its body. A dog's coat may be a
double coat, made up of a soft
undercoat and a coarser
topcoat, or a
single coat, which lacks an undercoat. Double coats have a top coat, made of stiff hairs to help repel water and shield from dirt, and an undercoat to serve as insulation. The terms
fur and
hair are often used interchangeably when describing a dog's coat, however in general, a double coat,
e.g., like that of the
Newfoundland and most
mountain dogs, is referred to as a
fur coat, while a single coat, like that of the
Poodle, is referred to as a
hair coat.