The Bottom Line: Microchipping Is Mandatory for Breeders, Recommended for All Owners
In Japan, a 2022 amendment to the Animal Welfare Act made microchipping mandatory for pet shops and breeders. For individual pet owners, it remains a strong recommendation rather than a legal requirement.
A microchip is a tiny IC chip about 2mm wide and 12mm long that stores a unique 15-digit ID number. When scanned with a dedicated reader, it links back to the owner's contact information — making it the single most reliable method for identifying lost or disaster-displaced pets. Unlike collars, which can fall off, a microchip stays with your cat for life.
How It's Done: Procedure, Cost & Pain
Procedure: A special syringe injects the chip under the skin between the shoulder blades. The needle is thicker than a standard vaccination needle, but no anesthesia is needed and the whole thing takes just seconds. The least stressful option is to have it done while your cat is already under anesthesia for spay/neuter surgery.
Cost: Typically $25 to $50 for the chip implantation, plus a small registration fee for the national pet database.
Pain: There's a brief pinch, but most cats barely react. Complications are extremely rare — the chip almost never migrates or malfunctions.
Registration & Updating Your Information
Where to register: Your country's national pet microchip database (in the US, companies like HomeAgain, Found.org, or PetLink; in the UK, the government's database; in Japan, the Ministry of the Environment).
Registration steps:
1. Your vet implants the microchip
2. The vet issues a microchip implantation certificate
3. You register online (or by mail) with the database
4. You receive a registration confirmation
When to update:
- Moving: File an address change
- Change of ownership: Transfer the registration to the new owner when rehoming
- If your cat passes away: Submit a notification of death
Critical reminder: Outdated contact information defeats the entire purpose. Always update your records when you move or change phone numbers.
Microchips as Disaster Preparedness
Major disasters have separated countless pets from their families. Collars can slip off, but a microchip is embedded under the skin and stays with your cat permanently.
Disaster preparedness checklist for cat owners:
- Microchip implanted with up-to-date registration
- At least 5 days' worth of food, water, and medications stockpiled
- Regular carrier training so your cat is comfortable going inside
- Clear photos of your cat (showing distinguishing features) saved on your phone
- Your vet's contact information readily accessible
- Vaccinations kept current
Keeping dated photos of anything unusual in CatsMe gives your vet a clear timeline at visits.
Common Misconceptions About Pet Microchipping
Let's clear up the most common misunderstandings about microchipping.
"It tracks my cat's location via GPS": Microchips contain no GPS technology whatsoever. They're passive identification devices that store a unique number readable only with a dedicated scanner. For real-time location tracking, you'd need a separate GPS collar tracker — an entirely different product.
"A collar with ID tags is enough": Collars break, slip off, or get caught on objects and detach. A microchip is the only permanent, tamper-proof identification method because it's implanted under the skin and cannot be lost. Best practice is to use both: a collar with visible tags for immediate identification, and a microchip as the fail-safe backup.
"The procedure is risky for my cat": With over three decades of global use and hundreds of millions of implantations, serious complications are virtually unheard of. The needle is larger than a standard vaccination needle, but the entire procedure takes just seconds and requires no anesthesia. Most cats react less to the microchip injection than they do to a routine vaccine.
"My indoor cat doesn't need one": Indoor cats escape more often than owners expect — through open doors during deliveries, broken window screens, or during natural disasters when walls and windows may be damaged. A microchip is cheap insurance that costs nothing to maintain once implanted and registered.
Practical Tips & How-To: Keeping Microchip Records Current
A microchip is only as useful as the information linked to it. Outdated contact details completely defeat the purpose of having one.
When to update your registration:
- Immediately after moving to a new address
- Whenever you change phone numbers
- When emergency contact information (family members, trusted friends) changes
- Once a year as a routine verification — set a calendar reminder
Register with multiple databases: Depending on your country, several microchip databases may operate independently. Registering with more than one increases the likelihood that a shelter or vet who scans your cat will connect to a database containing your current information. The small extra effort during registration pays enormous dividends if your cat ever goes missing.
Annual scan verification: During your cat's yearly health exam, ask your vet to scan the microchip to confirm it's still readable and hasn't migrated from its original position. While chip migration is rare, catching it during a routine visit is far better than discovering it during an emergency.
Transfer of ownership: If you've adopted or rehomed a cat, transferring the microchip registration to your name and contact information is essential. An alarming number of adopted cats have microchips still registered to previous owners, shelters, or breeders — rendering the chip useless if the cat gets lost under your care.
Record changes in your cat's expression with CatsMe
Along with microchip registration details, keeping vaccination and visit history together helps when you need it quickly. CatsMe (by Carelogy Inc.) uses AI to check a photo of a cat's face for signs of pain in its expression. It does not diagnose disease, assess overall health or replace a veterinarian; if you are worried, contact your vet regardless of the result.
- Keep dated records of vet visits and vaccinations to show your vet
- Records are kept per cat, so it works for multi-cat homes (iOS, Android and web, 14 languages)
- Developed with a background in university joint research; over 1 million checks run to date
Learn more about CatsMe →
獸醫問「什麼時候開始的？」你答得出來嗎？
CatsMe 用 AI 檢查貓咪臉部照片，查看表情中是否有疼痛跡象，並為每隻貓保存附日期的紀錄，方便與獸醫一起查看。它無法診斷疾病。
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