Companion Animal Microchipping: Welfare Through Identification

Microchipping companion animals significantly improves reunion outcomes for lost pets, preventing welfare harm from extended stray periods, shelter stress, and euthanasia of unidentified animals.

Key Facts

Microchipping of dogs has been compulsory in England since April 2016; mandatory cat microchipping began in June 2024.
Microchipped dogs are approximately 2.5 times more likely to be reunited with their owners than non-chipped dogs.
Approximately 4 million pets are separated from their owners annually in the US, with reunification rates of under 30% for unidentified cats.
Microchip implantation is a brief, low-pain procedure; welfare concerns are minimal and far outweighed by benefits.
Keeping microchip registration databases current is essential — chips linked to outdated contact information cannot facilitate reunions.

Welfare Considerations

Pet microchipping is one of the clearest examples of a low-welfare-cost intervention with high welfare benefit. The brief discomfort of implantation is negligible compared to the welfare benefit of preventing extended stray periods, shelter stress, and euthanasia for unidentified lost animals. The welfare impact extends beyond individual reunions to the aggregate reduction in shelter intake from identifiable lost pets. Mandatory microchipping with penalties for non-compliance has demonstrably increased microchip rates and improved reunification outcomes in countries that have implemented it.

What You Can Do

Microchip all pets and keep registration contact information current.
Check microchip database registration after any change of address or phone number.
Support mandatory microchipping legislation for cats in countries that have not yet implemented it.
Donate to lost pet recovery programs that utilize microchip scanning networks.
Scan any stray animal found for a microchip using rescue organizations or veterinary clinics.