A collar attachment is an item that is attached to a pet's collar for identification or safety purposes. The most common collar attachments are a LEASH, bell, ID tag, and LABEL. A LEASH is a rope or strap that is used to lead or restrain an animal, while a bell is a small device that makes a ringing sound when it is moved. An ID tag is a metal plate with information about the pet, such as its name and owner's contact information, and a LABEL is a piece of fabric or paper with information printed on it.