Calming Cap by Thundershirt The Calming Cap is a behavior management aid that is designed to lessen a dog's anxiety or aggression in high-stress situations. The Calming Cap reduces the visual stimulus that makes a dog agitated by filtering his/her vision. The single-panel sheer fabric window makes the dog's vision indistinct, while allowing the dog to easily navigate his surroundings. When paired with the Thundershirt, it becoms a perfect ancillary tool for dogs with extreme anxiety issues. Features: Comes in a variety of sizes to fit most breeds Gentle pressure has dramatic calming effect No need for medications Great for dogs with anxiety Also very useful in training Item Specifications: Sizes: XSmall: Most toy breeds, puppies Small: Most small terriers, Shelties, etc Medium: Cattle Dogs, Retrievers, Female German Shepherds and Rotties, etc Large: Mountain Dogs, Male German Shepherds and Rotties, etc