The Cavalier King Charles was adopted by the Royal courts of Europe. He was loved for its sweetness, its beauty and for its warmth. In castles and carriages, he warmed up the Kings and Queens lying on their knees. It is in England as the Spaniel dwarf becomes popular. As witnesses, the paintings of 16th century staged the English royalty in their company. The Cavalier King Charles takes its breed name under the reign of the King Charles I then King Charles II. During the 18th and 19th centuries, it is assumed that probably there were mixtures between Spaniel, Pekingese, and Carlin so the elongated nose from the Spaniel is singularly shortened during this period with a rounder head and a shorter chamfer. In 1920, the American Roswell Eldrig reinvigorate the race to find the type of Spaniel Blenheim dwarf dog.

From 1926 to 1929, the dog called Ann's Son won the Best Dog Prize. He served as model to create the standard of the modern breed of Cavalier King Charles. In 1995, the Kennel Club American recognizes the breed. In France, the “Livre des Origines Français” (the great book that lists all the origins of French breed dogs) counted 4 subjects in 1970. French livestock have stabilized in 1997 at about 2800 births per year.

The Club of English dwarf spaniels recognizes the King Charles by it nose without chamfer and the Cavalier King Charles. In Canada, the Canadian Kennel Club recognized the breed in 1957 and it was in 1973 that the Canadian Cavalier King Charles Spaniel Club has been created.