The term 'dog accessory' can be summarized by the solution to the crossword clue 'COLLAR, ' which is a six-letter word. A COLLAR is an item of clothing or jewelry worn around the neck, and it is often used as an accessory for dogs. It is usually made of leather, nylon, or other materials, and it can come in a variety of colors and styles. Collars are often used to attach a leash or identification tags, and they can also be used to show ownership of a pet.