<Tr> <Th> UKC </Th> <Td> Companion Breeds </Td> <Td> standard </Td> </Tr> <Tr> <Td_colspan="2"> Domestic dog (Canis lupus familiaris) </Td> </Tr> <P> The Cavalier King Charles Spaniel is a small spaniel classed as a toy dog by The Kennel Club and the American Kennel Club . It originated in the United Kingdom and is one of the more popular breeds in many countries . Since 2000, it has grown in popularity in the United States and ranks as the 18th most popular pure - breed in the United States (2013 Registration Statistics). It has a silky, smooth coat and commonly a smooth undocked tail . The breed standard recognizes four colours: Blenheim (chestnut and white), Tricolor (black / white / tan), Black and Tan, and Ruby . The breed is generally friendly, affectionate and good with both children and other animals; however, they require a lot of human interaction . Since they are a family dog, it is recommended to not leave them alone for long periods at a time . The expected average lifespan of a Cavalier King Charles Spaniel is under ten years . </P> <P> The Cavalier King Charles changed inordinately in the late 17th century, when it was interbred with flat - nosed breeds . Until the 1920s, the Cavalier shared the same history as the smaller King Charles Spaniel . Breeders attempted to recreate what they considered to be the original configuration of the breed, a dog resembling Charles II's King Charles Spaniel of the Restoration . Various health issues affect this particular breed . </P>

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