Do Cavalier King Charles Spaniels bark a lot?

No, Cavalier King Charles Spaniels are not known for excessive barking. They tend to be a relatively quiet and well-mannered breed.

That said, Cavalier King Charles Spaniels crave and require human companionship — more so than most other breeds. If they are separated from their humans for too long, they tend to express their anxiety by barking. As with any dog, they can be discouraged from barking as frequently with proper training, attention, and exercise.