Fi has been refining its GPS pet tracking technology for years, and the Series 3+ represents a clear leap forward. The headline feature here is the doubled GPS performance—this collar locks onto your dog’s location faster and holds it more reliably than previous models. That means no more waiting for a laggy position update when you open the app. The tracking works nationwide with no range limits, so whether your dog is in the backyard or a mile into the woods, you get real-time coordinates straight to your phone.

The real-world payoff comes with the escape alerts. You set up custom virtual fences in the Fi app—around your home, a campsite, or a friend’s yard. The moment your dog crosses that boundary, the collar sends an instant notification. It’s not a delayed summary; it’s a live ping every few seconds until you know where they are. The X-Large size fits dogs with neck sizes up to 28 inches, and the included nonstandard battery keeps the system running without daily charging hassles. For anyone who has spent a panicked hour searching for a bolted dog, this collar turns anxiety into a straightforward, actionable response.