My Department has responsibility for S.I. No 63/2015, the Microchipping of Dogs Regulation 2015 and S.I. 427/2015 - Microchipping of Dogs (Amendment) Regulations 2015. Under these Regulations, all dogs over 12 weeks of age (or younger if sold before 12 weeks) must be microchipped.
It is illegal to sell/supply a dog that is not microchipped. The microchip number must be registered; this helps to ensure the traceability of a dog that strays and improves the chance of return to the owner if a dog is stolen. As part of the registration process the owner is required to provide proof of address, such as a utility bill, or other verifiable documentation.
Currently there are no plans to update this legislation.