Your furry friend will look adorable for Halloween with this classic donut hat. The adjustable elastic strap allows this festive hat to fit most pets from dogs to cats. This easy to wear costume accessory can is a great way to include all members of the family this Halloween. How cute your pet will look on Social media or a Zoom call with Mom or Dad? Quality tested. Rubies Pet Shop Boutique. Rubies has been making great Halloween costumes and accessories since 1951. Pets should be supervised at all times while wearing dress up items.