"A dog licence is required in some jurisdictions to be the keeper of a dog. Usually a dog-licence identifying number is issued to the owner, along with a dog tag bearing the identifier and a contact number for the registering organization. If a stray pet is found with the tag, a rescuer can call the registering organization to get current contact information for the dog´s owner.
Licensing a dog might require additional actions on the owner´s part, such as ensuring that the dog has a current rabies vaccination. In many jurisdictions a fee, which is usually small, must be paid. Licences typically must be renewed annually or after some small number of years." - (en.wikipedia.org 26.12.2020)
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