Most pets these days are microchipped which is a great thing. Even birds and tortoises! Microchips allow your pet to be returned to you if they get lost or stray.
Unfortunately, we humans don't always stay in the same place and we don't always keep the same phone numbers or other contact details, so please make a note to check that the details your microchip company holds for you are up to date. Otherwise, returning your lost pet may not be possible.
As an added incentive, it is not only a legal requirement for all dogs to be microchipped now, but it is also a legal requirement for you to keep your details up to date