Make Your Sweet Puppy Look Like The Dangerous Creature He Thinks He Is With This Shark Costume. This Adorable Dog Costume Features A Polyester Shark Dorsal Fin Attached To An Elastic Band With Velcro Clasps That Fits Around Your Dog'S Tummy. A Smaller Band Connects To The Dog'S Collar To Hold The Fin In Place. For Dogs Weighing 8-13 Lbs. Pet Small Fits Neck Sizes 8-12 In, Chest 13-16 In, Back Length 11-13 In.