FCI group 9 · Companion and Toy Dogs · Derived from the adult weight midpoint (5 kg)
Uncited — a general reference figure, not a published one · no measured cohort for this breed
The King Charles Spaniel is a small dog breed of the spaniel type. In 1903, The Kennel Club combined four separate toy spaniel breeds under this single title. The other varieties merged into this breed were the Blenheim, Ruby and Prince Charles Spaniels, each of which contributed one of the four coat colours now seen in the breed.
Summary from Wikipedia (CC BY-SA) · reference ranges from the Kintail breed dataset