Do dog GPS trackers require a monthly subscription?

Many do. Cellular-based trackers like Tractive and Fi rely on a paid data plan to deliver real-time location, while handheld RF/GPS systems like the Dogtra Pathfinder line use your phone and charge no monthly fee. Factor the ongoing cost into your decision, since a cheap collar with a pricey subscription can cost more over time than a higher upfront no-fee system.