Our dog did not like the noises the dog tag makes while wearing her collar. So I designed and printed a little case.

• Print it at 0.2mm layer height. 
• Add a PAUSE (klipper) or M600 (marlin) at layer 18
• Place the dog tag inside the notch
• Resume the print

Dimensions of the inner oval are 25.5mm x 38.5mm.

It is a bit hard to put the dog tag with the case back on the ring, but it ensures that even if the material breaks, the dog tag stays on.

I added a step file if you want to remix this one for other cities.

Have fun!