Fi Series 3+

Why it is listed

Series 3+ is the everyday dog collar on this table: longest published battery, a real collar in the box, and a home charging base. You pay a membership, you are on AT&T, and the first term is at least six months. Buy it for battery and fit, not because GPS replaces a chip.

Pros & cons

Pros

• Official Fi comparison (updated 2026-08-12): 81.5×30×11.5 mm, 47 g, Fi Base included, AT&T, night light, IP68/66K, battery up to 3 months.
• Membership billing page: device is used with a prepaid membership — $99 / 6 months, $189 / 1 year, $339 / 2 years, plus a one-time $20 USD activation fee; 30-day satisfaction guarantee; 6-month minimum on first terms.
• What’s-included page: Series 3+ kit is the device, Fi Base, collar band, USB cable, 1-year warranty. Escape alerts and live GPS are membership features.

Cons

• Single U.S. carrier (AT&T) on the comparison chart — not Tractive’s AT&T + Verizon + T-Mobile list.
• Six-month minimum on the first membership term. Live GPS is not a one-time hardware purchase.
• A collar tracker is not a registered microchip (AVMA). Keep ID tags and chip registration current.

Score breakdown