Picking a pet ID tag for your Koolie is like buying insurance – you do it with the devout wish that you’ll never need it. The “possible price” of not having a pet ID tag is more expensive than the “real cost” of buying the pet tag itself.
The kind of pet ID tag that you buy is important, so take five minutes or so to consider it. Whimsically choosing a collar tag just because it’s inexpensive or pretty usually proves to be unwise, down the road.