Sibirskiy khaski) is a medium-sized working dog breed. Some other individuals also have the 'saddle back' pattern, in which black-tipped guard hairs are restricted to the saddle area while the head, haunches and shoulders are either light red or white. Striking masks, spectacles, and other facial markings occur in wide variety. All coat colors from black to pure white are allowed. Merle coat patterns are not permitted by the American Kennel Club (AKC) and The Kennel Club (KC). This pattern is often associated with health issues and impure breeding. The American Kennel Club describes the Siberian Husky's eyes as 'an almond shape, moderately spaced and set slightly obliquely.' The AKC breed standard is that eyes may be brown, blue or black; one of each or Particoloured are acceptable (complete is heterochromia). These eye-color combinations are considered acceptable by the American Kennel Club.