Quick answer: Geofencing lets you draw a virtual boundary — your yard, neighborhood, or any area — and receive an instant phone alert the moment your pet crosses it.
You define a safe zone in the app by drawing a circle or polygon on a map. When the tracker detects your pet outside that zone, it sends a push notification immediately. Most apps support multiple zones — home, the dog park, a friend's house.
GPS accuracy is typically 10-30 feet. If you set your boundary at the exact edge of your yard, you may get false alerts when your pet is actually still inside. Set the geofence slightly smaller than your actual boundary to account for GPS margin.
Alert speed depends on the tracker's update frequency. Real-time mode trackers send alerts within seconds. Power-saving mode trackers update every 5-10 minutes — your pet could be well outside the zone before you're notified. Use real-time mode when your pet is unsupervised outside.
Geofencing is one of the most practical features of any pet tracker. Configure it in real-time mode when your pet is outdoors unsupervised to get the fastest possible response.