Microchipping provides permanent identification for companion animals that facilitates reunion after loss, enables ownership tracing, and supports enforcement of welfare standards. Mandatory microchipping has improved welfare outcomes in multiple countries.
Microchipping addresses a fundamental welfare problem: lost animals that cannot be identified cannot be returned to their owners and face shelter housing, potential euthanasia, or life as a stray. The welfare benefit of microchipping operates at the individual level — a chipped lost dog can be returned home within hours rather than spending days or weeks in a shelter — and at the population level, as mandatory microchipping reduces stray animal populations and the welfare problems associated with life as a stray. Microchipping also enables enforcement of animal welfare legislation by allowing ownership of animals involved in cruelty cases to be established. The procedure itself causes brief, minor discomfort comparable to a vaccination. The welfare case for microchipping as a minimum responsibility for all companion animal owners is overwhelming.