The size of a Cavalier King Charles Spaniel can vary based on factors such as genetics, diet, and overall health. Cavaliers typically have a standard size range, with adult dogs generally weighing between 13 to 18 pounds (5.9 to 8.2 kg) and standing around 12 to 13 inches (30 to 33 cm) tall at the shoulder. Several factors can contribute to the size of a Cavalier King Charles Spaniel, and deviations from the typical size range for the breed might be influenced by genetics, diet, and overall health. While Cavaliers generally have a standard size range, individual dogs within the same breed can exhibit variations in size due to their genetic makeup.

If your Cavalier King Charles Spaniel is larger than the breed standard, it could be attributed to the genetics inherited from its parents. Additionally, diet plays a crucial role in a dog's growth and development. If your dog has been consistently overfed or given a diet rich in calorie-dense foods, it may contribute to excessive weight gain. Lastly, underlying health conditions or hormonal imbalances could also affect a dog's size. Consulting with a veterinarian can help determine if any health concerns are contributing to your Cavalier King Charles Spaniel's size and provide guidance on proper care and nutrition.