Size XS-S , Velcro adjustable, was used on a 9 pulling dog for reference - The Pet Inflatable Collar is a soft and adjustable protective recovery cone designed for dogs and cats. This unisex collar provides a comfortable fit for pets while preventing them from biting or licking their wounds during the recovery process. Its flat/rolled design allows for easy adjustment and personalized comfort for your furry friends. This innovative collar is a must-have for pet owners looking to provide gentle and effective protection for their pets in need.