Buying a pet identification tag for your Molossus is like buying an insurance policy – you do so with the faith that you’ll never need it. The “possible cost” of not having a pet ID tag is more expensive than the “real price” of buying the pet tag itself.
The type of pet identification tag that you buy is vital, so take 5 minutes or so to consider it. Impulsively choosing a collar tag just because it’s cheap or pretty usually ends up being foolish, in the long term.