Size: 20 (Please note that there may be a 1-2cm error due to manual measurement.) Attention: For cats and dogs with large faces, please measure the head circumference before selecting! * Due to the nature of the material, the size of the neck circumference may vary depending on the breed, physique, and amount of fur of the pet. * Please note: Returns and exchanges of Elizabethan collars are not accepted for hygiene reasons, so please measure your pet's neck circumference accurately before ordering.