The Coats of domestic dogs are of two varieties: "double" being frequent in dogs (together with wolves) originating from colder climates, built up of a coarse guard hair plus a comfortable down hair, or "one", Together with the topcoat only. Breeds may have an occasional "blaze", stripe, or "star" https://rowanhqydf.blogtov.com/12253513/the-best-strategy-to-use-for-dogs