We have an outdoor cat that we inherited from neighbors who moved out of state. She wears a collar with ID and a bell. It's a cheap collar from Walmart and has that elastic break-away aspect. Is this the kind that you buy, or is yours different? Anyway, Sassy's collar may last about 6 months before the elastic disintegrates and/or stretches, so I check the collar periodically and try to replace it before it reaches that breaking point. I've found her broken collar under bushes in our yard and even just out in the open in our yard, so I've usually been able to save her tags and have only had to reorder an ID once.