Fi Series 3+ vs Fi Mini
Scored head-to-head on every dimension — with a clear verdict and the best price on each.
Affiliate disclosure: As an Amazon Associate, PawBench earns from qualifying purchases. Prices shown are approximate and subject to change. Always verify current pricing on Amazon before purchasing.
Which one is right for you
- Choose Fi Series 3+ when
- You want the longest run between charges — Fi states up to 3 months for the Series 3+ collar against up to 2 months for the Mini — plus activity, sleep and behaviour monitoring.
- Choose Fi Mini when
- You want to keep the collar your dog already wears, or you have a small dog: the Mini is 16 g and clips onto most collars and harnesses.
Watch out for: Both need the same Fi membership, sold separately and chosen at activation, to keep GPS service active; the Mini costs less up front. The Mini has far fewer owner reviews and a lower average rating, so its score rests on thinner evidence.
| Spec | ||
|---|---|---|
| Buy | ||
PawBench Scoremethodology → | Reliability 67 Battery / Range 67 Ease of Use 64 Value 60 Owner Satisfaction 64 | Reliability 69 Battery / Range 69 Ease of Use 66 Value 61 Owner Satisfaction 52 |
| Buyer sentiment | Functionality Tracking Ease Of Use Peace Of Mind Responsiveness Buyers praise functionality, tracking, ease of use and peace of mind. Mixed feedback on battery life and accuracy. Some flag responsiveness. Based on 1,182 user mentions | — |
| Type | GPS smart collar | GPS tracker (collar attachment) |
| Battery Life | Up to 3 months (manufacturer-stated) | Up to 2 months (manufacturer-stated) |
| Membership | Required, sold separately (plan chosen at activation) | Required, sold separately (plan chosen at activation) |
| Connectivity | GPS + nationwide cellular | GPS + nationwide cellular |
| Waterproof | IP68 | IP68 |
| Charging | Wireless charging base | USB-C |
| Fits | Fi-affiliated collar bands only | Most collars and harnesses |
| Best For | Escape-prone dogs & activity tracking | Small dogs, and keeping the collar you already own |
| Weight | — | 16 g (0.56 oz) |
* Prices are approximate and may vary. Please check the latest price on Amazon.
What owners actually say
Not enough owner reviews aggregated yet.
Pros & cons
Fi Series 3+ GPS Dog Collar & Tracker (Membership Required)
Pros
- ✓Live GPS tracking on nationwide cellular, no range limit
- ✓Wireless charging base and a built-in LED light, per Fi
- ✓Manufacturer-stated up to 3 months of battery between charges
- ✓Escape alerts, safe zones and Lost Dog Mode
- ✓Activity, sleep and behavior monitoring in the Fi app
Cons
- ✗A Fi membership is required and sold separately; GPS service stops without one
- ✗Only fits Fi-affiliated collar bands, not a collar you already own
- ✗Bulky for very small dogs
Fi Mini GPS Dog Tracker (Membership Required)
Pros
- ✓Clips onto the collar your dog already wears
- ✓Live GPS tracking on nationwide cellular, no range limit
- ✓Lower hardware price than the Series 3+ collar
- ✓Escape alerts and virtual safe zones
- ✓Light at 16 g (0.56 oz) and IP68 waterproof
Cons
- ✗A Fi membership is required and sold separately; GPS service stops without one
- ✗Up to 2 months of battery — still short of the Series 3+ collar's 3 months
- ✗Fewer owner reviews than the Series 3+ collar, and a lower average rating