Question: Which breed has been used as a royal guard dog, Kuvasz or Cavalier King Charles Spaniel?

<P0-S0> The Cavalier King Charles Spaniel is a small spaniel classed as a toy dog by The Kennel Club and the American Kennel Club. <P0-S1>  It originated in the United Kingdom and is one of the more popular breeds in many countries. <P0-S2>  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). <P0-S3>  It has a silky, smooth coat and commonly a smooth undocked tail. <P0-S4>  The breed standard recognizes four colours: Blenheim (chestnut and white), Tricolor (black/white/tan), Black and Tan, and Ruby. <P0-S5>  The breed is generally friendly, affectionate and good with both children and other animals; however, they require a lot of human interaction. <P0-S6>  Since they are a family dog, it is recommended to not leave them alone for long periods at a time. <P0-S7>  The expected average lifespan of a Cavalier King Charles Spaniel is under ten years. <SEP> <P1-S0> Chiari-like malformation (CM) is the most common cause of foramen magnum obstruction and syringomyelia in dogs. <P1-S1>  Syringomyelia (SM) is a disease of the spinal cord typified by fluid filled cavities, or syrinxes, within the spinal cord substance. <P1-S2>  The disease is caused by the obstruction of cerebrospinal fluid (CSF), in the nervous system. <P1-S3>  A situation of high pressure in the spinal cord compared to low pressure outside, leads to fluid accumulation, which eventually forms cavities. <P1-S4>  CM is a condition characterized by the mismatch of size between the brain and the skull. <P1-S5>  The skull is too small causing part of the brain to descend out of the skull through the opening at its base, crowding the spinal cord. <P1-S6>  The cause of CM is not yet fully understood. <P1-S7>  CM is rare in most breeds but reportedly has become very widespread in the Cavalier King Charles Spaniel and the Griffon Bruxellois (Brussels Griffon). <P1-S8>  Some researchers estimate that as many as 95% of CKCSs may have CM. <P1-S9>  It is worldwide in scope and not limited to any country, breeding line, or kennel, and experts report that it is believed to be inherited in the Cavalier King Charles Spaniel. <P1-S10>  CM is so widespread in the Cavalier that it may be an inherent part of the CKCS's breed standard. <P1-S11>  This disease not only affects thousands of dogs, but a similar condition affects over three hundred thousand children yearly. <P1-S12>  Therefore, canines are an appropriate model for the treatment of the human condition. <SEP> <P2-S0> The Toy Trawler Spaniel is an extinct breed of Spaniel which physically was similar to the King Charles Spaniel of the 16th century. <P2-S1>  It is considered to have descended from the original King Charles Spaniel, and the older variety of Sussex Spaniel. <P2-S2>  It was originally used as a sporting dog, but became used as a toy and show dog. <P2-S3>  It was considered to be on the verge of extinction by 1920. <P2-S4>  A preserved specimen is kept in Tring at the Natural History Museum. <SEP> <P3-S0> The Kuvasz (] ), is an ancient breed of a livestock dog of Hungarian origin. <P3-S1>  Mention of the breed can be found in old Hungarian texts. <P3-S2>  It has historically been used as a royal guard dog, or to guard livestock, but has been increasingly found in homes as a pet over the last seventy years.