Buying a pet identification tag for your Sealyham Terrier is like purchasing an insurance policy – you do so with the devout wish that you’ll never use it. The “possible price” of not having a pet ID tag is more expensive than the “actual cost” of buying the pet tag itself.
The type of pet ID tag that you buy is important, so take five minutes or so to consider it. Impulsively choosing a collar tag just because it’s inexpensive or pretty usually ends up being unwise, down the road.