The dog-specific fields worth filling in
Every field matters, but a few carry unusual weight for dogs:
- Breed and colour — how the finder describes the dog in a neighbourhood group post
- Temperament note in the medical field — "nervous with men", "will not bite, will run" tells the finder how to hold on rather than lose the dog again
- Medication — dogs are more likely than cats to be on ongoing treatment; a missed dose is a real risk during a two-day absence
- Reward — motivates a call rather than a "someone else will deal with it"
- Emergency second number — dogs escape at the worst hours
Tag material: dogs are hard on hardware
Cats brush past furniture. Dogs swim, roll, dig, and drag their collars through gravel.
- Engraved or laser-marked metal is the only thing that reliably survives a year on an active dog
- Laminated plastic works for indoor and older dogs, and for the second tag on a harness
- Silicone-backed tags cut jingling and protect the surface
- Minimum 2×2 cm — collar scans are close-range, so small is fine, but tiny plus scratches is not
- Curved tags distort the pattern — flat faces scan far more reliably
Two tags beat one
Collars come off. Put a second code on the harness or the leash handle. It costs almost nothing and covers the most common failure mode: the dog slipped the collar, and the collar is in a hedge somewhere.
Where a dog QR helps besides "lost"
- Dog parks and daycare — staff can reach you without the front desk playing telephone
- Boarding and grooming — medical notes travel with the dog
- Walkers and sitters — vet number available without a handover conversation
- Assistance dogs — a scannable "working dog, do not distract" note plus handler contact
Chip and QR do different jobs
The microchip is legal proof of ownership, but it needs a vet or shelter with a reader — which means the dog first has to reach one. The QR tag works on the pavement, with the phone the finder already has, in the first minute. Do both.
Related pages
For the general profile builder, see the pet QR code generator. For cats — and their very different collar problem — see the cat QR code generator. For materials and printing, see the pet QR code tag guide.
How to make a dog QR tag in 4 steps
Pick the Pet ID type
In the generator above, choose Pet ID and set species to Dog, then add name, photo, breed, and colour.
Add medical and temperament notes
Medication, allergies, microchip number, and how the dog behaves with strangers — the note that helps a finder keep hold of them.
Enter two numbers plus your vet
Your phone, an emergency backup, and the clinic's number so an injured dog can be taken straight there.
Order a metal tag and test it
Export SVG, have it engraved on a flat metal tag, attach to collar and harness, then scan with an iPhone and an Android.
Frequently asked
Will the code still scan after months of mud and water?
On engraved or laser-marked metal, yes. QR error correction tolerates roughly 30% damage, so scratches and scuffs are survivable — but printed paper on an active dog is not.
How small can a dog tag QR be?
2×2 cm is a safe minimum. Collar scans happen at arm's length, so it does not need to be large — it needs to be flat and high-contrast.
Should I put the tag on the collar or the harness?
Both. Collars come off, and a dog that slipped its collar is the most common way a tag stops helping.
Does it replace the microchip?
No. The chip proves ownership but needs a vet or shelter scanner; the QR works instantly with any phone on the street. They cover different moments.
Can I add a 'nervous dog' warning?
Yes — put it in the medical information field. It renders on the profile and tells the finder how to hold the dog without frightening it into bolting again.
Read next
Need a different QR type? Browse all 48 QR types on the home page.