Blenheim, is the most common colour, ground pearly white background with well distributed chestnut-red patches. The chestnut on the head must extend around the eyes creating a mask effect as well as down over the ears separated by trail of white between the eyes and ears. These Cavaliers ideally should have a wide and clear blaze with a spot in the centre of their skull.

It is said that the spot or lozenge which can be found on the top of Blenheim’s heads, and whilst highly desirable but not essential, is known as the mark of the "Duchess Thumb Print" The Duchess of Marlborough supposedly, while awaiting news of her husband's safe return from the Battle of Blenheim, pressed the head of an expecting dam with her thumb, resulting in five puppies being born with the lucky mark, which followed the news that the battle had been won and the safe return of her husband.

Predominately black and white with well-defined mask , broken up with tan markings over eyes, cheeks, inside ears, inside legs and on underside of tail.

Rich glossy black overall with defined tan markings above the eyes, on cheeks, inside ears, on chest and legs and underside of tail. Tan should be bright. White marks are undesirable. 

Rich chestnut red over all the body. White markings undesirable.