The Cavalier King Charles Spaniel is a small spaniel classed as a toy dog by The Kennel Club. It is one of the most popular breeds in the United Kingdom. Since 2000, it has grown in popularity in the United States. It is a smaller breed of spaniel, and Cavalier adults are often the same size as adolescent dogs of other spaniel breeds. It has a silky, smooth coat and commonly a smooth undocked tail. The breed standard recognizes four colours: Blenheim, Tricolour (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.
The King Charles changed drastically 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, most notably mitral valve disease, which leads to heart failure. This appears in most Cavaliers at some point in their lives and is the most common cause of death. The breed may also suffer from syringomyelia, in which cavities are formed in the spinal cord, possibly associated with malformation of the skull that reduces the space available for the brain. Cavaliers are also affected by ear problems, a common health problem among spaniels of various types, and they can suffer from such other general maladies as hip dysplasia, which are common across many types of dog breeds.
The Cavalier King Charles Spaniel is one of the largest toy breeds. Historically it was a lap dog, and modern day adults can fill a lap easily. Nonetheless, it is small for a spaniel, with fully grown adults comparable in size to adolescents of other larger spaniel breeds. Breed standards state that height of a Cavalier should be between 12 to 13 inches (30 to 33 cm) with a proportionate weight between 10 to 18 pounds (4.5 to 8.2 kg). The tail is usually not docked, and the Cavalier should have a silky coat of moderate length. Standards state that it should be free from curl, although a slight wave is allowed. Feathering can grow on their ears, feet, legs and tail in adulthood. 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 be often 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 colours 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. There are several major differences between the two breeds, with the primary difference being the size. While the Cavalier weighs on average between 10 to 18 pounds (4.5 to 8.2 kg), the King Charles is smaller at 9 to 12 pounds (4.1 to 5.4 kg). In addition their facial features while similar, are different; the Cavalier's ears are set higher and its skull is flat while the King Charles's is domed. Finally the muzzle length of the Cavalier tends to be longer than that of its King Charles cousin.
Source of information: http://en.wikipedia.org/wiki/Cavalier_King_Charles_Spaniel
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