Fi Series 4 Smart Dog Collar vs Fi Series 3 Smart Dog Collar (2026): Head-to-Head Comparison

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.