These three products get compared because they all put GPS on a dog and all bill monthly. Beyond that they diverge. Fi sells a collar; the tracker is the buckle. Tractive sells a tracker that attaches to any collar. Halo sells a boundary system that happens to include tracking. The sensible comparison is not “which is best” but “which one is built for what I need”, and the spec sheets make that split visible. Everything below comes from manufacturer pages checked on October 7, 2026 and is marked where it could not be confirmed. BowlScout does not test trackers and does not evaluate health features; see the methodology page.
What Each One Is
Fi Series 3+ is a collar with an integrated tracker module. Fi’s collar page describes up to 3 months of battery, IP68 and IP66K certification in fresh and salt water to 50 metres, an industrial-strength stainless-steel frame rated for 500+ lb, a modular design for XS to XL dogs, LED lights and wireless charging. An active Fi Membership is required for GPS, activity monitoring and escape alerts.
Tractive GPS DOG 6 is a 39 g, 71 × 29 × 17 mm tracker rated IP68, recommended for dogs above 4 kg, per tractive.com. It uses LTE/4G (Cat1bis), Bluetooth 5.0 and 2.4 GHz Wi-Fi, claims up to 6 days of battery or up to 14 days with Power Saving Zones, and needs a Tractive subscription that covers the built-in SIM. The DOG 6 XL version (70 g, for dogs above 20 kg) extends the claim to 20 days, or 42 days with Power Saving Zones.
Halo Collar 5 combines a GPS boundary with location tracking. Halo specifies up to 48 hours with AlwaysOn GPS, a one-hour full charge, IP67, dogs at least 10 lb and 5 months old, and an adjustable 8–30.5-inch neck fit. Pack Membership is required. Sound, vibration and static feedback need a training plan; a fence collar is not a containment guarantee.
Side-by-Side Specifications
| Specification | Fi Series 3+ | Tractive GPS DOG 6 | Halo Collar 5 |
|---|---|---|---|
| Form | Collar with integrated tracker | Clip-on tracker for your own collar | Collar with integrated fence/tracker module |
| Primary job | 24/7 wearable locator and activity | Locator for home and travel | GPS boundary with feedback, plus tracking |
| Battery claim | Up to 3 months | Up to 6 days; up to 14 days with Power Saving Zones | Up to 48 hours; one-hour full charge (maker claims) |
| Charging | Wireless charging (Fi page) | Not stated on the page | Magnetic charging |
| Water rating | IP68 + IP66K; fresh and salt water to 50 m | IP68, “100% waterproof” | IP67 |
| Weight and size | Not on the collar page (third-party listings: 28 g module) | 39 g; 71 × 29 × 17 mm | Not stated on the page |
| Dog size | Modular XS–XL; no weight floor on page | Dogs above 4 kg (XL: above 20 kg) | Over 5 months and 10 lb; neck 8″–30.5″ |
| Connectivity | GPS; cellular type not stated on the page (third-party: LTE-M) | LTE/4G Cat1bis, Bluetooth 5.0, Wi-Fi 2.4 GHz | Cellular data, GPS, Wi-Fi and Bluetooth; update-rate wording differs across maker sections |
| Coverage statement | Not published on the collar page | “175+ countries” | Worldwide (Halo) |
| Zones and alerts | Escape alerts (membership) | Virtual fences with escape alerts | Wireless dog fences created and edited in the app (membership) |
| Feedback to the dog | None (LED light only) | None | Six feedback types: sound, vibration, static |
| Activity features (maker claims) | Activity, sleep, AI behaviour detection (scratching, licking, barking) | Activity, sleep, heart and respiratory rate | Not quoted here (fence feedback is the primary feature) |
| Plan | Fi Membership required | Tractive subscription required | Pack Membership required per collar |
| Trial / return | 30-day membership trial (support site) | 30-day money-back guarantee | 90-day satisfaction guarantee |
| Warranty | Puppy Warranty (free swap when a puppy is full grown); standard term not on page | Not stated on the product page | 1-year warranty |
Unconfirmed items: Fi’s module weight and cellular type appear only in third-party listings and are excluded from the cards; Fi’s membership plan lengths (6-month, 1-year, 2-year) come from the text of a support article whose page returned an error during our check. The purchase link is for Collar 5, Midnight; check the selected variant and required membership.
Where the Differences Bite
Battery: three months, two weeks, two days
Battery claims reflect different jobs and conditions. Fi is a wearable locator; Tractive’s longest figure uses a power-saving zone. Halo Collar 5 also runs a GPS boundary, and its up-to-48-hour claim is a ceiling, not a guaranteed charging interval. Check the charge daily and follow the maker’s instructions.
Water: swimmers vs splashers
Fi (IP68 + IP66K, to 50 m by its statement) and Tractive (IP68) are rated for immersion. Halo’s IP67 is rated for temporary immersion to about a metre. A dog that swims every day fits the first two by the makers’ ratings.
Size floor: small dogs and cats
Tractive publishes the clearest floor — above 4 kg for DOG 6, with a separate CAT 6 Mini for cats 3–8 kg. Halo’s floor is 10 lb and 5 months. Fi describes XS sizing without a weight figure on its collar page. For a cat, only Tractive in this trio has a documented product.
The fence question
Only Halo acts on the dog. Fi and Tractive notify you after the dog leaves a zone. If your problem is a dog that leaves, Halo is a different category with a training commitment that its age minimum reflects. If your problem is finding a dog that has already left, Fi and Tractive are built for that and Halo’s tracking is a secondary feature.
The Cards
Halo Collar 5 is the current fence-collar option here. Pack Membership is required; check the selected Midnight listing and plan separately. Check Halo Collar 5 on Amazon
Fi Series 3+ Smart Collar
Best for: Dogs that wear a collar 24/7 and owners who want the longest stated battery life in this set.
- Fi states “up to 3 months of battery” and IP68 + IP66K rating “in fresh and saltwater up to 50 meters”
- modular design “fit for XS to XL dogs”; stainless-steel frame; LED lights; wireless charging
- an active Fi Membership is required to use GPS, activity monitoring and escape alerts
Tractive GPS DOG 6
Best for: A light clip-on tracker for dogs above 4 kg that travel with you.
- 39 g, 71 × 29 × 17 mm; “100% waterproof (IP68)”; recommended for dogs “above 4 kg”
- battery “up to 6 days”, or up to 14 days with Power Saving Zones set
- LTE/4G (Cat1bis), Bluetooth 5.0 and 2.4 GHz Wi-Fi; a Tractive subscription covers the built-in SIM
Tractive GPS DOG 6 XL
Best for: Large dogs (above 20 kg) whose owners want to charge as rarely as possible.
- 70 g, 83 × 47 × 20 mm; IP68; Tractive lists it “only for dogs above 20 kg”
- battery “up to 20 days”, or up to 42 days with Power Saving Zones
- same app features as DOG 6: live tracking, virtual fences, activity and sleep; subscription required
Plans: What to Compare, Without Prices
Each maker requires a plan, and the terms differ in structure more than in price. Fi’s support site describes 6-month, 1-year and 2-year memberships, a 1-year default at activation with a 7-day window to switch, and one membership per collar. Tractive’s help pages describe Basic (one country, 24-hour location history, monthly billing in some countries) and Premium (175+ countries, 365-day history, longer terms). Halo describes three Pack Membership tiers and says a plan is required for each collar. Our subscription guide explains what the plan pays for, and the calculator lets you enter the current prices and battery figures to compare running cost and charging frequency over the years you expect to own the device.
Quick Checklist Before You Buy
- You have named the job: wearable locator (Fi), travel tracker (Tractive), or boundary (Halo)
- Your dog clears the maker’s floor: 4 kg for Tractive DOG 6, 10 lb and 5 months for Halo, XS–XL fit for Fi
- The battery claim fits how often you will charge, under the condition the maker states
- The water rating matches your dog’s habits
- You have read the plan terms on the maker’s page and know the per-collar rule
- For Halo: you accept the training commitment a fence collar needs, and you have confirmed which collar generation the listing sells
- You know the trial or return window before activating a plan
Frequently Asked Questions
Which has the longest battery life?
By the makers’ claims, Fi Series 3+ (up to 3 months), then Tractive DOG 6 (up to 14 days with Power Saving Zones), then Halo Collar 5 (up to 48 hours). The conditions differ, and live tracking shortens all of them.
Can Fi or Tractive keep a dog in the yard?
No. They send escape alerts after the dog leaves a zone. Only Halo in this comparison gives the dog feedback at a boundary.
Does any of them work without a plan?
No. Fi, Tractive and Halo each state that a plan is required for GPS and cellular features. For no-plan options, read the subscription guide.
Are the health and behaviour features medically useful?
We do not know, and we do not assess them. Fi and Tractive describe them as app features; BowlScout quotes the descriptions and leaves any health question to your veterinarian.