I have the same problem with Harley. I even find her metal tags mangle and chewed up in the yard. (She has a thing about chewing on metal.) Anywho, although I can not do anything about the rabies and microchip tags, I did have a brass plate engraved and attached to her collar with my personal information on it. She can't lose that unless she looses the whole collar. I had mine made by a friend who does engraving and attached to the collar with rivets. This would work for leather as well as nylon collars. We are still working on the microchip and rabies tag issues. Hope someone has a good idea.