Microchipping Your Dog: How It Works, What It Costs, and Why It Matters

A microchip is a tiny piece of technology, roughly the size of a grain of rice, that provides a permanent form of identification for your dog. According to the AVMA, microchipped dogs are returned to their owners at more than double the rate of dogs without chips. At a cost of $15 to $50, microchipping is one of the least expensive and most consequential things you can do for your dog’s safety. Yet the chip is only as effective as the registration database behind it, and many owners make critical errors that render their dog’s chip useless.

How Microchips Work

A dog microchip uses Radio Frequency Identification (RFID) technology. The chip itself contains no battery or moving parts. It sits dormant under the skin until activated by a compatible scanner, which emits a low-frequency radio signal that powers the chip and causes it to transmit its unique identification number. That number is linked to your contact information in a registration database.

The AVMA emphasizes an important distinction: microchips are not GPS trackers. They cannot locate your dog in real time or provide location data. They work only when a scanner is passed directly over the chip, which is why they are a complement to, not a replacement for, a collar with visible identification tags.

The Implantation Procedure

Microchip implantation is a simple outpatient procedure that takes seconds and can be performed during any veterinary visit, including puppy vaccinations, spay-neuter surgery, or a routine wellness exam. The process is similar to a vaccination:

A veterinarian or trained technician uses a sterile, preloaded syringe with a slightly larger needle than a standard vaccine to inject the microchip beneath the skin between the shoulder blades. The procedure does not require anesthesia, though many owners choose to have it done during a procedure that already involves sedation.

Most dogs react no more than they would to a routine injection. Mild soreness at the injection site may last a day or two but rarely requires treatment. Complications are extremely rare and may include minor migration of the chip from its original position, which does not affect functionality.

Cost of Microchipping

According to PetMD, a dog microchip costs between $15 and $50 when implanted at a veterinary clinic. This fee typically includes the chip itself and the implantation procedure. Registration in the manufacturer’s database may be included or may require a separate fee of $15 to $25.

Lower-cost microchipping is available through several channels:

Humane societies and animal shelters often include microchipping with adoption fees or offer it at reduced cost ($10 to $20)
Mobile vaccination clinics frequently offer microchipping alongside vaccines at discounted prices
Community events organized by animal welfare organizations sometimes provide free or low-cost microchipping
Pet retailers may offer microchipping events at lower prices than full-service veterinary clinics

Registration: The Step Most Owners Forget

Implanting a microchip without registering it in a database is like locking your front door and throwing away the key. The chip contains only an identification number. Without a registration linking that number to your name, phone number, and address, a shelter or veterinarian scanning a lost dog can identify the chip but cannot contact you.

The AVMA’s microchipping FAQ emphasizes that the most common reason microchipped animals are not returned to their owners is incorrect or disconnected contact information in the registry. After implantation, immediately register the chip through the manufacturer’s website or by phone. Your veterinarian will provide the registration information.

Equally important is updating your registration whenever you move, change phone numbers, or transfer ownership of the dog. Set a calendar reminder to verify your microchip registration annually, ideally at the time of your dog’s annual wellness exam.

Most microchip manufacturers offer free basic registration with the option to pay $15 to $30 for premium features like lost pet alerts, travel assistance, and access to a 24-hour recovery hotline. The free registration is sufficient for the core purpose of reunification.

The Evidence for Microchipping

The AKC and AVMA cite compelling research supporting microchip effectiveness:

A study of more than 7,700 stray animals at animal shelters across 23 states found that microchipped stray dogs were returned to their owners at more than double the overall rate for all stray dogs. Among the microchipped dogs that were not returned, the overwhelming majority of failures were due to incorrect owner information in the database, not chip malfunction.

Microchips last for the lifetime of the dog without needing replacement, recharging, or maintenance. They do not degrade, expire, or lose their programmed identification number. Once implanted and registered, the chip provides permanent identification that cannot be removed, lost, or separated from your dog the way a collar and tags can.

Microchip vs. GPS Tracker vs. ID Tags

These three identification methods serve different purposes and work best in combination:

Method	Purpose	Pros	Cons	Cost
Microchip	Permanent ID when scanned	Cannot be lost or removed; lifetime duration	No real-time tracking; requires scanner	$15-$50 one-time
GPS tracker (collar)	Real-time location tracking	Shows exact location; app-based	Requires charging; can be lost with collar; subscription fee	$50-$150 device + $5-$15/month
ID tags (collar)	Visible contact info	Immediately readable by anyone; no technology needed	Can be lost; tags wear out; collars can break	$5-$15

The ideal approach uses all three: ID tags for immediate identification by Good Samaritans, a microchip as permanent backup when tags are lost, and a GPS tracker for real-time monitoring of dogs that are escape-prone or live in areas with wildlife risks.

Checking Your Dog’s Microchip

At every wellness exam, ask your veterinarian to scan your dog’s microchip to confirm it is still readable and to verify the registration number. This takes seconds and confirms:

The chip is functioning properly
The chip has not migrated significantly from its original position
The number on file matches your registration records

The AVMA designates “Check the Chip Day” each August as a reminder for all pet owners to verify their microchip registration is current.

Special Considerations

International travel. Many countries require an ISO 15-digit (ISO 11784/11785 compliant) microchip for entry. If your dog has an older 9-digit or 10-digit chip, you may need to have an ISO-compliant chip implanted before traveling. Having two microchips is safe and not uncommon.

Adopted dogs. If you adopt a dog that already has a microchip, contact the chip manufacturer to transfer registration to your name and contact information. Shelters may provide the chip number and manufacturer, or your vet can scan the dog and look up the chip registry.

For a comprehensive view of one-time and recurring costs of dog ownership, see our complete dog health and vet costs guide.