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Quick summary
- Best for activity only: FitBark 2. No subscription and up to 6 months per charge, but no GPS.
- Best GPS + activity value: Tractive DOG 6. Cheap to buy, with activity, sleep, and vital-sign tracking, but it needs a plan.
- Best health insights: Fi Series 3+. Detailed behavior tracking in a built-in collar, at a higher yearly cost.
- Best for small dogs with GPS: FitBark GPS (2nd Gen), at 16 g.
- Skip Whistle: Whistle shut down in 2025 after Tractive bought it. Its devices no longer work.
An activity tracker shows how much your dog moves, rests, and sleeps, so you can spot changes over time and share trends with your vet. Some are fitness-only. Others add GPS so you can find a dog that slips out.
This guide is based on manufacturer specs, published pricing and plan terms, and owner reviews. We have not used these trackers ourselves; see How We Research Products. Comparing battery life on the GPS models? See GPS Tracker Battery Life Compared. Prices checked October 2026.
Top Picks
- FitBark 2
Best for: Activity only. No subscription and up to 6 months per charge, but no GPS.
View at FitBark - Tractive DOG 6
Best for: GPS + activity value. Activity, sleep, and vital-sign tracking, but it needs a plan.
View at Amazon - Fi Series 3+
Best for: Health insights. Detailed behavior tracking in a built-in collar, at a higher yearly cost.
View at Fi
Comparison Table
| FitBark 2 | Tractive DOG 6 | Fi Series 3+ | FitBark GPS (2nd Gen) | Halo Collar 5 | |
|---|---|---|---|---|---|
| Description | Tiny clip-on activity and sleep monitor with no GPS and no subscription. | Budget GPS tracker that also logs activity, sleep, and resting heart and breathing rates. | Smart collar with built-in GPS and detailed activity, sleep, and behavior tracking. | Adds cellular GPS to FitBark’s activity and sleep tracking in a 16 g device. | GPS fence and training collar that also tracks walks, activity, and rest. |
| Price (checked Oct 2026) | $39.95 on sale (list $69.95) | $47.40 on Amazon (list $79) | $129 (sale prices seen around $90) | $34.95 on sale (list $69.95) + plan | $524 on sale (list $599) |
| Subscription | None | From $5/mo (5-year prepay); about $9–$10/mo yearly | $189/yr default; $99 for 6 months; $339 for 2 years | From $5.95/mo (3-year prepay) to $9.95/mo monthly | From $9.99/mo |
| GPS | No | Yes | Yes | Yes | Yes |
| Activity & sleep | Yes | Yes, plus heart and breathing rate | Yes, plus behavior (licking, scratching, etc.) | Yes | Activity and rest |
| Battery (listed) | Up to 6 months | Up to 2 weeks | Up to 3 months | Weeks; varies by use | Up to 48 hours |
| Weight / dog size | 10 g; dogs 3 lb+ | Dogs 8.8 lb+ | Collar sizes XS–XL | 16 g; pets 5 lb+ | Collar |
| Best for | Fitness only, no fees | GPS + activity on a budget | Deep health insights | Small dogs needing GPS | Virtual fencing |
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What About Whistle?
Whistle trackers are no longer sold or supported. The service shut down on August 31, 2025, after Tractive acquired the brand, and former owners were offered a move to Tractive. If you see a Whistle device for sale, skip it.
How to Choose
Do you need GPS?
If your dog never leaves your side, a fitness-only tracker like FitBark 2 saves you a monthly fee.
Count the plan, not just the device.
Over two years, plan costs usually outweigh the hardware price.
Check battery life.
Activity-only trackers last months; GPS models need charging every few days to weeks. Our battery life comparison goes deeper.
Match your dog’s size.
Check the minimum weight listed for each tracker.
Need live location too? See GPS tracker vs GPS fence basics.
Privacy tip: check what location and activity data the app keeps. Our guide to location data privacy explains what to look for.
Frequently Asked Questions
Do dog activity trackers need a subscription?
Not always. FitBark 2 works with no subscription. GPS trackers like Tractive, Fi, FitBark GPS, and Halo need a paid plan because they use cellular data.
Can an activity tracker find a lost dog?
Only if it has GPS. FitBark 2 tracks activity and sleep but cannot show your dog’s location.
Which tracker has the longest battery life?
Among these, FitBark 2 is listed at up to 6 months. Fi Series 3+ is listed at up to 3 months, and Tractive DOG 6 at up to 2 weeks.
Is Whistle still available?
No. Whistle shut down in August 2025, and Tractive is the company that took over its customers.
Can I share activity data with my vet?
FitBark lets you invite a vet or trainer to view data. Fi and Tractive keep long-term trends in their apps that you can show at a visit.
Can a tracker help on days my dog is home alone?
An activity tracker shows how active your dog was while you were out. It doesn’t detect or treat anxiety. If your dog struggles when left alone, talk to your vet and see our guide to pet calming aids.
The Bottom Line
If you just want to know how active your dog is, FitBark 2 is the easy, fee-free pick. If you also want GPS, Tractive DOG 6 is the best value, and Fi Series 3+ offers the richest health insights for a higher plan price.