The expected average lifespan of a Cavalier King Charles Spaniel is between nine and fourteen years.The Cavalier King Charles changed dramatically in the late 17th century, when it was interbred with flat-nosed breeds. 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. Hip dysplasia is a common genetic disease that affects Cavalier King Charles Spaniels. It is not present at birth but develops with age. Hip dysplasia is diagnosed by X-rays, but it is not usually evident in X-rays of Cavaliers until they mature.
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