Microchipping dramatically improves the welfare outcomes for lost companion animals by enabling reunification with owners — yet microchipping rates remain low in many countries and demographics.
Lost animals that cannot be reunited with their owners face welfare harms in shelters and on the streets — stress, disease exposure, and risk of euthanasia for space. Microchipping is the single most reliable intervention enabling reunification. The welfare benefit operates through the simple mechanism of identity persistence — an animal's connection to its owner survives the chaos of being lost or stolen. The failure mode is outdated registry information: a microchipped animal with a disconnected phone number is effectively unchipped.