
It is a common mistake of mixing the Cavaliers with the Charlies. They come from the same dogs but from the reign of William & Mary the flatter faces with a domed skull were fashionable so the King Charles were selectively bred for flat "baby"like faces.
Pictures of the breed called The English Toy Spaniel & the Blenhiem Spaniels from 1400's to the the 1690's show them with longer muzzles etc like the Cavaliers !
The quest to rebuild the Cavalier(from Charles's I/ II time)started in 1926 & the breed was recognized eventually as the Cavalier King Charles Spaniels