Since they are family dogs, it is recommended to not leave one alone for long periods at a time. 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. Until the 1920s, the Cavalier shared the same history as the smaller King Charles Spaniel. Standards require this be kept long, with the feathering on the feet a particularly important aspect of the breed's features.The Cavalier King Charles Spaniel and the English Toy Spaniel can often be confused with each other. In the United Kingdom, the English Toy Spaniel is called the King Charles Spaniel, while in the United States, one of the colors of the Toy Spaniel is known as King Charles. The two breeds share similar history and only diverged from each other about 100 years ago.
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