Buying a pet ID tag for your Border Collie is like purchasing an insurance policy – you do so with the faith that you’ll never use it. The “possible cost” of not having a pet ID tag is more costly than the “actual cost” of purchasing the pet tag itself.
The type of pet identification tag that you buy is important, so take 5 minutes or so to think it through. Impulsively choosing a collar tag just because it’s cheap or trendy often proves to be foolish, in the long term.