Choosing between Fi Series 4 Smart Dog Collar and Fi Series 3 Smart Dog Collar comes down to what you prioritise — price, performance, or specific features for your dog.
Short answer: Fi Series 4 Smart Dog Collar wins for most dogs and situations. But Fi Series 3 Smart Dog Collar is the better choice in specific cases outlined below.
Side-by-Side
| Fi Series 4 Smart Dog Collar | Fi Series 3 Smart Dog Collar | |
|---|---|---|
| Price | $169.00 | $149.00 |
| Rating | ★★★★★ 4.5/5 | ★★★★☆ 4.4/5 |
| Score | 9.3/10 | 8.9/10 |
| Best for | gps, 4-month-battery | gps, smart-collar |
Fi Series 4 Smart Dog Collar
$169.00 | ★★★★★ 4.5/5
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Best GPS collar 2026 — 4-month battery and instant escape alerts make it indispensable
Pros:
- 4-month battery is industry-best
- Sleek lightweight design
- Best escape detection on market
Cons:
- Monthly plan required ($8.25–$15.99/mo)
- No health vitals like PetPace
Choose this if: gps, 4-month-battery, escape-detection.
Fi Series 3 Smart Dog Collar
$149.00 | ★★★★☆ 4.4/5
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Best GPS collar for active owners — 3-month battery is class-leading
Pros:
- Best battery life in class
- Escape alerts
- Activity insights
Cons:
- Monthly subscription required ($8.25/mo)
- Heavy for small dogs
Choose this if: gps, smart-collar, activity-tracking.
Our Verdict
Fi Series 4 Smart Dog Collar wins overall on performance and value. If budget is the primary concern or you need gps or smart-collar, Fi Series 3 Smart Dog Collar is the alternative.
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