Dog coats are very different and are grouped by coat length, thickness, texture and color-pattern. Some of the definitions of the coat can be used to describe the particular variety of breed. For instance the Kerry blue terrier or Wired haired terriers. Knowing what type of coat and what color will make your choices for grooming and grooming products easier.
There are three types of hair that grows on a dog. They are the undercoat, guard hair or top coat and whiskers. Human hair grows one hair from each hair follicle while dogs can have one hair or many from one follicle. The undercoat is a thick downy layer that is below the top coat. The undercoat hair is the hair that grows in clumps from one follicle. The top coat is longer, coarser, water repellent hair serving as protection from the weather. Whiskers are longer and thicker versions of regular hair spaced sparsely. They contain nerve receptors, are used for warning, protection and are very sensitive.