For 2 dogs Dogtra Pathfinder mini GPS

The Dogtra Pathfinder brings GPS and e-collar technology right to your smartphone, giving you a more intelligent and responsive way to track and train your dogs. The Pathfinder truly works without using cellular data*. Just download the free maps and operate your smartphone in offline map mode. Unlike other GPS e-collars, there are no extra navigation packages to purchase.
 
You have access to Google Maps™ with satellite and terrain views and the ability to track up to 21 dogs or hunters, share locations, playback data and create customizable Geo-Fence alerts. With an incredibly fast two-second update rate and a powerful zoom capability, the Pathfinder tracking feature provides greater live-action detail and accuracy when you’re in the field.