Microchipping dramatically improves reunification rates for lost pets. Understanding the evidence helps owners, shelters, and policymakers make the case for universal microchipping.
Microchipping is one of the highest-ROI welfare interventions available to companion animal owners — a brief, inexpensive procedure that dramatically improves the probability of reunification if an animal is lost. The welfare benefit is direct: reunified pets avoid the stress and welfare compromise of shelter confinement or life as strays. The gap between the potential and actual effectiveness of microchipping is primarily one of registration and updating: a chip that leads to a disconnected phone number or outdated address provides no benefit. National legislation mandating microchipping, combined with universal registries that connect all chip brands, maximizes effectiveness. Countries with mandatory microchipping demonstrate better outcomes, providing a policy evidence base for advocacy.