Best GPS & Activity Trackers

GPS trackers attach to your dog's collar and let you locate them in real-time via your phone. They're essential for escape artists, hunting dogs, and anyone who hikes or camps with their dog off-leash. Most use cellular networks (like a tiny phone on your dog's collar), which means they require a monthly subscription — typically $5-13/month.

The Fi collar and Whistle are the market leaders. Fi uses LTE-M cellular with outstanding battery life (weeks, not days). Whistle combines GPS with health monitoring (activity, sleep, scratching patterns). AirTags work as a cheap alternative for urban settings but rely on nearby iPhones and don't provide real-time tracking — they're better for finding a lost dog in your neighborhood than tracking a runner across open land.

Battery life is the most important spec. A tracker that dies after 2 days forces you into a recharging routine you'll eventually forget. Look for 2+ weeks of battery on a single charge. Some trackers have "lost dog mode" that increases GPS polling frequency at the cost of battery — a smart tradeoff when it matters most.