The term "Cavalier" is a more recent addition to the name and distinguishes the breed from the older, more flat-faced "King Charles Spaniel".
Here's a breakdown:
* Cavalier King Charles Spaniel: This is the modern, more popular breed with a shorter, rounder muzzle. They're known for their gentle, loving personalities.
* King Charles Spaniel: This is the older breed with a longer, more flat muzzle. They're still affectionate, but can be a bit more independent.
It's important to note that the term "King Charles Spaniel" can refer to both types, so it's always best to be specific when talking about them.