The Cavalier King Charles Spaniel is a small spaniel classed as a toy dog by The Kennel Club and the American Kennel Club, that originated in the United Kingdom. It has a silky, smooth coat and commonly a smooth undocked tail. The breed standard recognizes four colors: 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 much human interaction. A white blaze between the eyes is standard of the Tricolour variety. The Cavalier King Charles Spaniel and the English Toy Spaniel can often be confused with each other. 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 skull is domed. Finally, the muzzle length of the Cavalier tends to be longer than that of its King Charles cousin.