On the weekends we have photographers and volunteers come out to the shelter who do not always know our cats. They can scan them for a microchip or flag down staff, but it isn't always time conducive. Are there any ideas on how we could safely label them all? We have cards hanging on the wall but without pictures they are not very helpful. We were thinking cheap paper collars but we wouldn't want the cats to get snagged on anything. Does anyone have some safety conscious, affordable suggestions for labeling free roaming cats?