The main difference between the FitBark 2 and the FitBark GPS is location tracking.
The FitBark GPS has an embedded cellular connection that allows it to be traceable anywhere it has a cellular signal in the U.S. In addition, it provides Wi-Fi safe place entry/exit alerts, and it periodically syncs a dog’s health data (typically every hour) via Wi-Fi without requiring a smartphone nearby like the FitBark 2.
These additions make the FitBark GPS a tiny bit bigger than the FitBark 2, and come at the expense of battery life. While the FitBark 2 has a battery life in the range of months, the FitBark GPS can typically go on for a few weeks before needing to be recharged.
Finally, the FitBark GPS comes with a subscription plan, while the FitBark 2 does not have additional fees.