 The four sets of markings reflect the four former breeds from which the modern breed was derived. Black and tan markings are known as "King Charles", while "Prince Charles" is tricoloured, "Blenheim" is red and white, and "Ruby" is a single-coloured solid rich red. The "King Charles" black and tan markings typically consist of a black coat with mahogany / tan markings on the face, legs and chest and under the tail. The tricoloured "Prince Charles" is mostly white with black patches and mahogany / tan markings in similar locations to the "King Charles". The "Blenheim" has a white coat with red patches, and should have a distinctive red spot in the center of the skull.
