Dog Tags From £5.95 | Personalised & For Charity | Dogs Trust Having up to date contact details on your dog’s tag is often the quickest way for you to be reunited with your best friend should the worst happen. In 1992 it was made a legal requirement that any dog in a public place must wear a collar with the name and address (including postcode) of the owner engraved or written on it, or engraved on a tag.