The Fi Series 3+ GPS Dog Tracker Collar solves a specific problem: knowing where your dog is, instantly, anywhere in the US. This X-Small version is built for dogs under 20 pounds, a size range many trackers ignore. The key upgrade here is the GPS performance—Fi claims it’s twice as accurate as their previous generation, and in testing, it locks onto a signal faster and holds it better through dense tree cover or urban canyons.

The real value lives in the escape alerts. You set a virtual fence in the Fi app, and the collar pings your phone the second your dog leaves that zone. The notifications arrive every few minutes until you acknowledge them, which is useful if you’re driving or in a meeting. Battery life depends on how often the collar checks in—expect about three months on the standard setting, less if you use live tracking frequently. The collar itself is lightweight and the nylon strap is comfortable enough for daily wear, though the buckle feels a bit plasticky for the price.

One honest limitation: the cellular service requires a subscription (about $10/month) to keep the GPS and alerts active. That’s standard for this category, but it’s an ongoing cost to factor in. For small-dog owners who want real-time location data and escape notification without carrying a heavy brick on their pet’s neck, this is the most capable option available right now.