The Cavalier King Charles Spaniel and King Charles Spaniel are two different breeds, although they are closely related. The Cavalier King Charles Spaniel is recognized by major kennel clubs such as the American Kennel Club (AKC) and the Kennel Club (KC) in the UK, while King Charles Spaniel is recognized only by the KC in the UK. The Cavalier King Charles Spaniel is a slightly larger breed, with a more pronounced muzzle and longer snout than King Charles Spaniel. Cavaliers have a more expressive face, with larger, rounder eyes and long ears that are set lower on the head. Cavaliers have longer, silkier coats than King Charles Spaniels. The Cavalier's coat is generally straight or slightly wavy, while the King Charles' coat is typically shorter and more curly. Both breeds are known for their friendly and affectionate temperament, but the Cavalier is generally considered to be more outgoing and sociable, while King Charles can be more reserved and independent. Cavaliers are generally considered to be a healthier breed than King Charles Spaniels. Cavaliers have a lower incidence of health problems such as mitral valve disease and syringomyelia, which are more common in the King Charles Spaniel breed.