Hehe, I realize you already have your answer, but wanted to throw in my 2 cents. We have tags from the city, CGC, Home Again and his ID tag, so we bought a Quiet Spot tag holder. It's a pouch to hold the tags, and it also keeps them from clanking together and getting worn down.
I use the "collar tags" from boomerang tags. They clip on the collar so no jingling.
I'm allergic to nickel and have to coat any metal that touches my skin with clear nail polish (rivets in jeans, buttons, belt buckles, etc) and it really doesn't last that long, especially if there is constant friction/pressure on it. I'd say a week max. Never tried it on dog tags but I would imagine you'd have to reapply it fairly often for it to be really effective.
I have the same problem with my dogs' tags.
Very cute! I thought they were Stainless Steel with an enamel design.
Both dogs have a white chest, but now with grey stains under their tags. :(
Since these tags stain the fur, does that mean they are not Stainless Steel?
I was thinking of switching to plastic to stop this problem. I used to buy Boomerang tags with my German Shepherds and they had good quality tags. I just thought the ones I bought were so cute and I hate to give them up.