Most Cavalier King Charles Spaniels weigh 13-18 pounds. You can find a breed description on the American Kennel Club website.
However ideal weight should be determined for dogs as individuals. Looking at the body condition score as well as actual weight is important. You should be able to feel the ribs, spine, and hip bones easily but they should not jut. Dogs should have an hour glass waist when viewed from above and an abdominal tuck when viewed from the side.
Ask your veterinarian to assess your dog's current and ideal body condition as well as weight.
However ideal weight should be determined for dogs as individuals. Looking at the body condition score as well as actual weight is important. You should be able to feel the ribs, spine, and hip bones easily but they should not jut. Dogs should have an hour glass waist when viewed from above and an abdominal tuck when viewed from the side.
Ask your veterinarian to assess your dog's current and ideal body condition as well as weight.