What are the different type of coats of dogs?

The coats of domestic dogs are of two varieties: "double" being familiar with dogs (as well as wolves) originating from colder climates, made up of a coarse guard hair and a soft down hair, or "single", with the topcoat only. Breeds may have an occasional "blaze", stripe, or "star" of white fur on their chest or underside.[32] Premature graying can occur in dogs from as early as one year of age; this is associated with impulsive behaviors, anxiety behaviors, fear of noise, and fear of unfamiliar people or animals.

The coat of a dog varies depending on its breed. Typically a dog could have either a "double" coat or a "single" coat. "Double" coats are originated from breeds that live in colder climates. This type of coat consist of a coarse guard hair and a soft down hair. Dogs with "single" coat only has the topcoat.