Red Headed Tris
A red headed tricolor may have some black on its head or it may have very little or no black markings on the head. Often as the dog ages, the black on the head lessens.
Black Headed Tris
It is perfectly acceptable to have a Pembroke Welsh Corgi that is black and tan with no white, but a Pembroke Welsh Corgi that is black and white with no tan present is a mismark. The tan is often not present at birth, but appears within a few weeks after birth.
Red can be a bit deceiving when they are tiny puppies. Many times they will have black on their faces but as they grow the black disappears and they become all red.
To give you an idea about what I mean, here is both Fidget and Manny as newborns.
Red comes in different shades.
My "Wolfie" is my first real dark sable. He is too young to produce puppies yet. I am anxious to see his puppies. I think his color is awesome.
Beth's grandmother Courtney's grandfather
A dog may be lightly sabled, with just a scattering of black-tipped hairs over the withers, to one who is so heavily sabled that from a distance he almost appears black. The head has the distinctive "cap" with a widow's peak and black on back and edges of his ears and is sabled around his longer neck ruff with some sabling over the body, down the back and on the hair covering the tailset.
Medium length; short, thick, weather-resistant undercoat with a coarser, longer outer coat. Over-all length varies, with slightly thicker and longer ruff around neck, chest and on the shoulders. The body coat lies flat. Hair is slightly longer on back of forelegs and underparts, and somewhat fuller and longer on rear of hindquarters. The coat is preferably straight, but some waviness is permitted.