The rarest colour Cavalier King Charles spaniel is Black and Tan.
This breed typically has four recognised colour patterns: Blenheim (chestnut and white), Tricolour (black, white, and tan), Ruby (solid red), and Black and Tan.
Among these, the Black and Tan is less commonly seen compared to the others.
This colour pattern features a primarily black coat with tan highlights, particularly around the eyebrows, cheeks, inside the ears, chest, and beneath the tail.
It’s important to note that while some colours are rarer than others, all colours are equally valued in terms of breed standards and health.
If you’re considering a Cavalier King Charles Spaniel, remember that temperament and health are far more important factors than coat colour.
Ensuring you obtain your dog from a reputable breeder who conducts necessary health screenings is crucial.