Fi has been making GPS dog collars for years, and the Series 3+ is their most refined version yet. The key upgrade is cellular-based GPS tracking with no range limits, meaning your dog can wander anywhere in the country and you’ll still see their real-time location in the app. For dog owners who live near woods, open fields, or even just have a crafty escape artist, this matters.

The collar uses a nonstandard battery that ships included and charges via the provided USB cable and charger. Battery life is solid for daily wear, though you will need to charge it every few days depending on how often the GPS pings. The virtual fence feature sends alerts the instant your dog leaves a safe zone, which feels immediate and reliable in real-world testing. The gray collar is lightweight enough for small dogs, and the app interface is straightforward to set up without digging through menus.

One honest limitation: the cellular connectivity means the collar requires an active subscription plan to function. That’s an ongoing cost to factor in. Build quality feels durable for everyday use, but it’s not ruggedized for extreme chewers or heavy brush. For a dependable, no-fuss tracker that prioritizes accuracy over gimmicks, the Series 3+ does the job well.