Picking a pet ID tag for your Patterdale Terrier is like buying insurance – you do so with the faith that you’ll never use it. The “possible cost” of not having a pet ID tag is more expensive than the “real price” of purchasing the pet tag itself.
The kind of pet identification tag that you buy is vital, so take 5 minutes or so to think it through. Whimsically purchasing a collar tag just because it’s low cost or cute often proves to be unwise, long-term.