We have tried nearly everything here at Wind and Willows Ferret Rescue to tag cages-- for most of our FN cages we use magnetic file cabinet label holders... they fit over the fn logo spot -- drawback is some of the ferrets take great joy in knocking them to the floor... When I have to add pictures and instructions I usually just number the cage and put a binder together with picture pages , instructions etc.. easy to update and add medications etc.. we also keep a write on board on the wall with a list of who belongs in which # cage.. for the super pet cages we number the base near the door.. usually with a bit of masking tape I also keep an updated meds list-- on the medicine cart.. and another near the frig. hope this helps Lisa [Posted in FML 7873]