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A dog tag, cat tag, pet ID tag, or pet tag is a small flat tag worn on pets' collars or harnesses.
Humane societies and rescue organizations recommend that dogs and cats wear these tags, which present that the wearer is not a stray, and contain information to enable someone encountering a lost pet to contact the owner. In the UK, dog owners are required by law to ensure that their dog is wearing an ID tag, even if the dog has already been microchipped (also required by UK law).
Tags may make noise as animals move. A collar-mount tag, either slide-on or riveted-on flat to a collar's surface, is silent. A tag silencer encloses loose tags in a small neoprene pouch or a soft rubbery plastic ring around the edge of a tag and may reduce noise.
The resemblance of human identification tags to this method of display led to military identification tags being called dog tags.