Works in 46 countries
The Ask A Vet GPS Tracker works in 46 countries across North America, Europe and Asia-Pacific, Australia, New Zealand and Japan among them. Fi states the Series 3+ covers North America and much of Europe.
GPS tracker comparison
Fi Series 3+ vs Ask A Vet GPS Tracker
A GPS smart collar and a GPS tracker with a touchscreen, side by side.
Fi facts checked
The short answer
Both need a subscription, and both give live GPS tracking, safe zones with escape alerts, a collar light, and activity and sleep insights for dogs. Where you live decides it first: Fi states the Series 3+ covers North America and much of Europe. The Ask A Vet GPS Tracker works in 46 countries across North America, Europe and Asia-Pacific, and adds vets in the same app (with Premium), training and custom sounds and a touchscreen that shows alerts. Fi suits owners who want eating, drinking and licking tracked.
Side by side
How the two trackers compare
Ask A Vet GPS Tracker figures come from our product page. Fi figures are quoted from Fi’s own pages. “Not listed” means Fi’s pages do not mention it.
| Feature | Ask A Vet GPS Tracker | Fi Series 3+ |
|---|---|---|
| What it is | GPS tracker with its own mobile connection and a colour touchscreen | GPS tracker and health monitor in an all-in-one smart collar |
| How it finds your pet | GPS, plus Wi-Fi, mobile masts and your phone over Bluetooth when it is nearby | Live GPS over a cellular connection |
| Updates with no phone nearby | Yes, over LTE-M and NB-IoT where there is coverage | Yes, over cellular, at any distance with coverage |
| Live tracking | Yes, LIVE mode for frequent updates | Yes, continuous live GPS, plus Lost Mode and Search Party |
| Where it works | Works in 46 countries. Check yours on the tracker page | North America and much of Europe |
| Subscription needed | Yes: the Tracker Plan or Premium | Yes: a Fi Membership, in 6-month, 1-year or 2-year terms |
| Safe zones and escape alerts | Safe and no-go zones with escape alerts | Unlimited geofences with 24/7 escape alerts |
| Activity and sleep | Steps, calories, activity and sleep | Steps, activity and sleep |
| Other health signals | Bark counting and temperature alerts | AI detection of barking, scratching, licking, eating and drinking, and AI answers from Fi Intelligence |
| Vets in the app | With Premium: unlimited AI Vet chat, 2 certified vet chats a month and discounted telehealth video calls | AI vet records. Vet chat not listed |
| Screen on the tracker | Colour touchscreen showing steps, activity, sleep and your pet’s ID | Not listed |
| Alerts on the tracker screen | Medication reminders, leaving a safe zone, temperature warnings and a lost-pet alert pop up on the screen with a chime | Not listed |
| Light on the collar | LED light in any colour you choose with the colour picker, solid or rainbow | Colourful LED lights for night walks |
| Sounds on the collar | Eight tones on the collar, four on your phone | Not available on the Series 3+, Fi states |
| Custom sounds | Add your own short sounds, such as your voice, and play them on the collar from the app | Not listed |
| Training sounds | Clicker, whistle and Come Back tones played on the collar from the app, for recall, mealtimes and quiet time | Not listed |
| Vibration cues | Three strengths, within Bluetooth range | Not listed |
| ID for whoever finds your pet | Built-in QR pet ID: a finder needs no app, and Lost mode alerts you when it is scanned | Not listed |
| Dogs, cats and size | Dogs and cats over 4 kg | Dogs: Fi lists it for medium to large dogs, on a Fi collar in sizes XS to XL. Fi’s cat tracker is the Fi Mini |
| Phones | iPhone on iOS 15.1 or later, Android 7.0 or later | iPhone on iOS 17 or later, Android 9.0 or later |
The difference
Which one fits your pet?
Where the Ask A Vet GPS Tracker is different
Certified vets in the same app
With Premium you get 2 certified vet chats a month and discounted telehealth video calls, plus unlimited AI Vet chat, in the app that holds your pet’s tracker data. Fi’s pages list AI answers and AI vet records, but no vet chat.
Training and custom sounds on the collar
Play a clicker, whistle or Come Back tone, or your own short sounds such as your voice, on the collar from the app, with vibration cues within Bluetooth range. Fi states sound is not available on the Series 3+.
A screen that travels with your dog
When a friend, sitter or family member takes the leash, alerts like a medication reminder or leaving a safe zone pop up on the collar with a chime. It also shows daily stats at a glance, from steps to sleep. Fi’s pages do not list a screen.
An ID whoever finds your pet can scan
The Ask A Vet GPS Tracker has a built-in QR pet ID. A finder scans it with a phone camera, no app needed, and Lost mode alerts you when it is scanned. Fi’s pages list Lost Mode and Search Party, which alerts nearby Fi members, but no finder ID.
Where Fi Series 3+ may suit you better
You want eating and drinking tracked
Fi states the Series 3+ uses AI to detect barking, scratching, licking, eating and drinking. The Ask A Vet GPS Tracker counts barks and sends temperature alerts.
Your pet is under 4 kg
Fi makes a smaller tracker, the Fi Mini, which Fi says suits all dogs, big or small, and indoor or outdoor cats. The Ask A Vet GPS Tracker is for dogs and cats over 4 kg.
You want the tracker built into the collar
The Series 3+ is an all-in-one smart collar, and Fi states its stainless steel frame handles dogs that pull and chew.
If coverage beyond North America and Europe, vets in the same app, training and custom sounds, or a screen that shows alerts to whoever has the leash matter more to you, the Ask A Vet GPS Tracker is the better fit.
Questions
Fi Series 3+ or Ask A Vet GPS Tracker: your questions
Answers about Fi are taken from Fi’s own pages, read on 27 October 2026.
Where does Fi work?
Fi’s help centre lists the countries where the Fi app is available: the U.S., Canada, the U.K. and a list of European countries, and Fi describes the Series 3+ coverage as North America and much of Europe. The Ask A Vet GPS Tracker works in 46 countries: check yours on the tracker page.
Does the Fi collar need a subscription?
Yes. Fi lists a subscription as required: a Fi Membership, in 6-month, 1-year or 2-year terms. The Ask A Vet GPS Tracker also needs a plan, Ask A Vet’s Tracker Plan or Premium, and Ask A Vet Premium adds vet chat and discounted telehealth video calls.
Does Fi have vet chat?
We found no vet chat or telehealth on Fi’s product, app or help pages. Fi’s pages list AI vet records and Fi Intelligence, which gives AI answers based on your dog’s health and breed. With Ask A Vet Premium, the AI Vet and certified vets are in the same app as your tracker.
Does the Fi collar work for cats?
Fi lists the Series 3+ for medium to large dogs. Its cat tracker is the Fi Mini, which Fi says supports indoor or outdoor cats. The Ask A Vet GPS Tracker is one tracker for dogs and cats over 4 kg; for a cat under 4 kg, look at the Fi Mini.
Can the Fi collar play sounds?
Fi states sound is not available on the Series 3+; its sound and vibration recall, Fi CallBack, comes on Fi Ultra, which Fi lists for the United States only. The Ask A Vet GPS Tracker plays eight tones on the collar, training tones such as a clicker, a whistle and Come Back, and your own short sounds, such as your voice. Cues help build routines and are not a substitute for professional training.
Why does the Ask A Vet GPS Tracker have a screen?
Dogs don’t always head out with the person who has the app. When a friend, sitter or family member takes the leash, the screen shows them important alerts directly, with a chime: a medication reminder, leaving a safe zone, a temperature warning or a lost-pet alert. It also shows daily stats at a glance, from steps to sleep, and your pet’s ID. Fi’s pages do not list a screen on the Series 3+.
Can someone who finds my dog contact me?
The Ask A Vet GPS Tracker has a built-in QR pet ID: a finder scans it with a phone camera, no app needed, and Lost mode alerts you when it is scanned. Fi’s pages list Lost Mode and Search Party, which alerts nearby Fi members, but no finder ID on the collar. Either way, keep your dog microchipped and wearing an ID tag.
How do I switch from Fi?
Set up the Ask A Vet GPS Tracker in the Ask A Vet app: it pairs over Bluetooth, then you add your pet and choose a plan. Your Fi Safe Zones and history do not move across, so draw your safe zones again. Cancel your Fi Membership with Fi.
Ready to choose?
The Ask A Vet GPS Tracker works with the Ask A Vet app on a Tracker Plan or Premium. Check it works in your country on the tracker page before you buy.
Sources
Ask A Vet GPS Tracker figures come from our product page. Fi figures come from these pages, read on 27 October 2026:
- Fi Series 3+ product page
- Fi home page
- Fi’s comparison with Apple AirTag
- Fi Tracker use during international travel
- Set Up Your Fi Series Tracker
Specifications change, so check Fi’s current pages before you buy. Fi is a trademark of its owner. Ask A Vet is not affiliated with Fi.