Dog tag and Tag

Dog tag noun - Metal plate on a dog collar bearing its registration number.

Tag and dog tag are semantically related. in labeling topic. In some cases you can use "Tag" instead a noun phrase "Dog tag".

Tag noun - A slip (as of paper or cloth) that is attached to something to identify or describe it.

Dog tag and tag are semantically related. Sometimes you can use "Dog tag" instead a noun "Tag".