If you've ever wondered why your Cavalier follows you from room to room, there's an actual reason for it: this breed was built for companionship, not for a job.
Cavalier King Charles Spaniels descend from the small spaniels kept by English nobility for one purpose — company. Unlike working spaniels bred to flush birds or retrieve, the Cavalier's ancestors spent their days on laps, in drawing rooms, and at their owners' heels. Generations of that history left a dog that is, by nature, tuned to people.
That shows up in a few familiar ways. Cavaliers tend to bond hard, often to one person in particular, though they rarely meet a stranger they don't like. They read a room well, settling quietly during a calm evening and lighting up the second something interesting happens. And they don't do well with long stretches of being left alone — this is a breed that would rather be bored next to you than entertained by itself.
None of this makes them high-maintenance so much as high-context. A Cavalier is happiest as part of what's happening, not off to the side of it. If you're the kind of person who talks to your dog like they understand every word, a Cavalier will do their best to prove you right.