Buying a pet ID tag for your Tervuren is like buying an insurance policy – you do it with the faith that you’re never going to need it. The “possible cost” of not having a pet ID tag is more expensive than the “actual price” of buying the pet tag itself.
The kind of pet identification tag that you buy is crucial, so take 5 minutes or so to think it through. Whimsically picking a collar tag because it’s low cost or cute often proves to be unwise, down the road.