I only have rabies tags on mine...however, there is a number on that which Ibelieve can be linked to my dogs if someone where to call the vet and ask.

A dog I use to own got away once. He had no tags on but it only took me a few hours to find him. We only have one small HS on the island, so I knew they would take him there. I had to pay a lot to get him seeing he didn't have an ID tag though