Since 2000, it has grown in popularity in the United States and ranks as the 19th most popular pure-breed in the United States. While the Cavalier weighs on average between 13 to 18 pounds (5.9 to 8.2 kg), the King Charles is smaller at 9 to 15 pounds (4.1 to 6.8 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 skull is domed. Finally, the muzzle length of the Cavalier tends to be longer than that of its King Charles cousin.
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