Buying a pet ID tag for your Rottweiler is like buying insurance – you do so with the devout wish that you won’t need 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 identification tag that you buy is crucial, so take 5 minutes or so to think it through. Impulsively buying a collar tag just because it’s low cost or cute often proves to be a regret, down the road.