Fi vs Tractive: choose Tractive DOG 6 if you want the lighter, cheaper-to-run tracker that clips onto any collar and works in 175+ countries. Choose Fi Series 3+ if you want a smart collar with a battery that lasts months and a built-in light. For small dogs, Fi Mini is the one that competes head-on with DOG 6. That is the verdict. The reasoning and the money math follow.
Tractive GPS Dog 6
Tractive lists the DOG 6 at 39 g with IP68 waterproofing, a 2.8 cm maximum collar width and 4G/LTE tracking, with Bluetooth and Wi-Fi for finding it nearby. It clips onto the collar you already own, so you are not buying a new collar. Coverage is 175+ countries, which beats Fi's 35 if you travel. The trade-off is a 14-day battery at best, so you charge it more often than a Fi collar.
Check price on Amazon →You have a dog that slips out, or one you cannot see in tall grass, and you want a map on your phone. Both brands sell hardware that does nothing without a paid membership, so the total cost matters more than the box. This is a researched comparison built from manufacturer pages and Amazon listings, not a field test. We computed the 2-year costs ourselves.
Tractive DOG 6 wins for most dogs. Tractive lists it at 39 g with IP68 waterproofing and up to 14 days of battery with Power Saving Zones. Fi Series 3+ wins on battery life (up to 3 months per Fi) and all-in-one design. Large dog? Tractive's DOG 6 XL is built for dogs above 20 kg. Neither tracker corrects your dog, so neither replaces a fence. Budget for the membership.
Quick comparison
| Product | Best for | Key detail | Price class | |
|---|---|---|---|---|
| Top pick Tractive GPS Dog 6 | Most dogs above 4 kg, owners who want a clip-on tracker | 39 g, IP68, up to 14 days (6 days without Power Saving Zones), 175+ countries | $ · Budget | Check price |
| Tractive DOG 6 XL | Large and heavy dogs above 20 kg | 70 g, IP68, up to 6 weeks (20 days without Power Saving Zones) | $ · Budget | Check price |
| Fi Series 3+ | Owners who want a smart collar with months of battery | Battery up to 3 months, LED night light, escape alerts, Fi coverage in 35 countries | $$ · Mid-range | Check price |
| Fi Mini | Puppies and small dogs, or a tracker on a favorite collar | 16 g clip-on, up to 2 months per Fi, IP68, escape alerts | $$ · Mid-range | Check price |
Our picks, one by one
Tractive GPS Dog 6Our Pick
Tractive lists 71 x 29 x 17 mm, 39 g, IP68 waterproofing and a recommended dog weight above 4 kg. It uses LTE/4G with GPS, GLONASS and Galileo, plus Bluetooth and Wi-Fi. Virtual fences send an escape alert when your dog leaves a safe area. Health features cover activity, sleep and scratching, and Tractive states these are not diagnoses and a vet should be consulted. Amazon listings show a 2-year manufacturer warranty.
Check price on Amazon →Tractive DOG 6 XLBest for Big Dogs
Tractive lists the XL at 83 x 47 x 20 mm and 70 g, with IP68 waterproofing and battery of up to 6 weeks with Power Saving Zones or 20 days without. The recommended dog weight is above 20 kg. If you want a tougher case, the XL Adventure is listed at 100 g for dogs above 25 kg and collar widths up to 5 cm. Its longer battery makes it the better pick for a dog that rides out in a truck or lives on acreage. Tractive says the XL is only for dogs above 44 lbs.
Check price on Amazon →Fi Series 3+Best Battery
Fi's site lists up to 3 months of battery, live GPS, an LED night light and escape alerts. Listings describe IP68 waterproofing, a stainless steel frame and wireless charging. Fi also adds Search Party, which alerts nearby Fi members when your dog is in Lost Mode. Health readings cover activity, rest, eating, drinking and scratching. These are general trends, not diagnoses. Fi's support page lists 1-year and 2-year prepaid memberships, and Amazon sells some bundles with 1 to 12 months included.
Check price on Amazon →Fi MiniBest for Small Dogs
Fi lists the Mini at 16 g, compared with 40 g for the DOG 6. It clips to any collar or harness (Fi sells an adapter for collars about 1.5 inches wide) and is IP68 rated. You get virtual fences and an escape alert when your dog leaves. Membership is required. For a dog small enough that a 39 g tracker looks heavy, this is the lightest option in this guide.
Check price on Amazon →The numbers side by side
| Spec | Tractive DOG 6 | Tractive DOG 6 XL | Fi Series 3+ | Fi Mini |
|---|---|---|---|---|
| Weight | 39 g | 70 g | Not published | 16 g |
| Waterproof | IP68 | IP68 | IP68 (listings) | IP68 (listings) |
| Battery (maker) | 14 d / 6 d | 42 d / 20 d | Up to 3 months | Up to 2 months |
| Dog size | Above 4 kg | Above 20 kg | Fi collar sizes | Small dogs, any collar |
| Coverage | 175+ countries | 175+ countries | 35 countries | 35 countries |
| Plan required | Yes | Yes | Yes | Yes |
Tractive's two battery figures are with and without Power Saving Zones, which cut location updates when your dog is at a place you mark as safe, like home.
2-year membership cost
Hardware is a price class, but plan fees decide the winner here. Fi's figures come from Fi's support page. Tractive's US annual figure is the one quoted on Fi's own comparison page, so confirm it on Tractive's US plan page before you buy.
| Tracker | Hardware | 1-year plan | 2 years of plan |
|---|---|---|---|
| Tractive DOG 6 or XL | $ | $108 | $216 |
| Fi Series 3+ | $ | $189 | $339 (2-year prepaid) |
| Fi Mini | $ | $189 | $339 (2-year prepaid) |
Formula: 2-year cost = 1-year plan x 2 for Tractive. Fi uses its 2-year prepaid price, which is lower than $189 x 2 = $378.
Tractive's own page also sells Basic and Premium tiers, with Premium adding family sharing, worldwide coverage, 365-day location history and data export. Basic keeps 24 hours of history. Fi lists a minimum 6-month commitment on all plans. In 2 years Tractive's annual plan costs about $123 less than Fi's cheapest prepaid, and that gap is bigger than any spec difference in this guide.
How we chose
We compared current Tractive and Fi models that are sold on Amazon.com against five checks: size and weight, battery under the maker's best-case conditions, waterproof rating, coverage by country, and the cost of the plan over 24 months. We left out older Tractive models such as the DOG 4, which Tractive's current US range replaces. Our data comes from Tractive's own spec page and Fi's site and comparison page. Fi's comparison page is written by Fi, so we treated its claims about Tractive as claims, not facts, and used it only for the US plan figure. We did not compare health-sensor accuracy, because neither brand publishes independent validation.
Which one for your dog
- Dog under about 10 lb: Fi Mini at 16 g, or Tractive DOG 6 if your dog is above 4 kg, which Tractive lists as its minimum.
- Medium dog, typical suburban life: Tractive DOG 6. Lowest plan cost and it moves between collars.
- Big dog, farm or trail life: DOG 6 XL. The 20-day or 6-week battery fits long days outdoors.
- You hate charging: Fi Series 3+, with the longest battery claim in this guide.
- You travel abroad: Tractive, with 175+ countries against Fi's 35.
- You want to correct the dog at the fence line: neither. See our GPS dog fence guide.
Tracker versus fence: do not mix them up
A tracker tells you where your dog is, and a virtual fence on these devices only sends you an alert. Nothing happens to the dog at the line. That is a feature if you want a gentle option and a limit if you want containment. The collars in our GPS dog fence guide add warning tones and optional static correction. The American Veterinary Society of Animal Behavior (AVSAB) recommends reward-based training only and advises against aversive tools, so a tracker plus recall training is a perfectly defensible approach.
Who should NOT buy a GPS tracker
Skip it if your dog never leaves a fenced yard and your phone is the only thing you worry about losing. A tracker will not fix a broken gate. If your dog is under 4 kg, check the maker's weight guidance first. Tractive lists 4 kg as its minimum for the DOG 6, so a tiny puppy needs the 16 g Fi Mini or a smaller option. Also skip health-alert features as a vet substitute. Both brands say these are trends, and a change in your dog's behavior is a call to your vet, not an app.
Mistakes to avoid
- Counting only the box price. The plan is the bigger cost by year two.
- Expecting two weeks of battery without setting up Power Saving Zones.
- Letting the membership lapse by accident. A lapsed tracker shows nothing on the map.
- Putting the tracker on a loose collar. A tracker on a collar your dog can slip is a very expensive paperweight.
- Forgetting to test it: walk the block and watch the map update before you need it.
What an escape alert really gives you
Both brands let you draw a safe zone, usually around home, and message your phone when your dog leaves it. That alert is only as fast as your reaction. If you are asleep, in a meeting or on the other side of the house with the TV on, you will find out later. A few habits close the gap.
- Turn on push notifications and make sure they can break through Do Not Disturb.
- Share the app with a second adult in the house, if the plan allows it. Tractive's Premium tier lists family sharing, and Fi lists shared access for household members.
- Make the safe zone slightly larger than your yard so a GPS wobble at the fence line does not trigger false alerts at night.
- Learn where Lost Mode or live tracking is in the app before the day you need it. Panic is a bad time to find a menu.
Search Party on Fi alerts nearby Fi members when your dog is in Lost Mode. That helps in dense neighborhoods and does nothing on a rural road with no other Fi users, so do not count it as your primary plan.
Small-dog sanity check
Weight on the collar matters more for small dogs than the spec sheet suggests. A 39 g tracker plus a clip is a visible lump on a toy breed. Fi lists the Mini at 16 g, less than half. Tractive lists 4 kg as the minimum dog weight for the DOG 6. If your dog is below that, or if the dog is a puppy still growing, start with the Mini and make sure the collar fits two fingers beneath it. Check the clip or adapter width against your collar: the DOG 6 fits widths up to 2.8 cm, and the XL up to 4 cm.
Our verdict in three rules
- Buy Tractive DOG 6 if you want the lowest plan cost and a tracker that moves between collars.
- Buy Fi Series 3+ if charging every week is the thing that makes you abandon gadgets.
- Buy the Fi Mini or the Tractive XL only when your dog's size points you there: under about 10 lb for the Mini, above 44 lbs for the XL.
Whichever you pick, put the plan into your calendar. A tracker without an active membership shows nothing when you need it most.
If you are still undecided, ask one question: do you travel with your dog outside North America and Europe? If yes, Tractive is the only one of the two with a 175+ country list. If no, the choice comes down to battery habits and plan cost, and the table above gives you both.
Our #1 pick: Tractive GPS Dog 6
If you only read one line of this guide: this is the one we would buy.
Check price on Amazon →Frequently asked questions
Is Fi or Tractive better?
Tractive wins for most dogs on size, coverage and plan cost. Fi wins if you want months of battery in a built-in smart collar.
Do Fi and Tractive require a subscription?
Yes. Both trackers use cellular service, so both need a paid plan. Without it, neither shows your dog's live location.
How long does the Tractive DOG 6 battery last?
Tractive lists up to 14 days with Power Saving Zones and up to 6 days without. The XL lists up to 42 days and 20 days.
Does a GPS dog tracker work without cell service?
No. Both brands send location by cellular network, so you need coverage where your dog is. Check each brand's coverage map before you buy.
Can a GPS tracker diagnose a health problem?
No. Tractive says its health alerts are not diagnoses and a vet should be consulted. Treat any activity or sleep change as a prompt to call your vet.
Price classes are a rough guide; check the current price on Amazon. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.