![Amazon.com: Dogtra Pathfinder TRX Additional Receiver 9-Mile 21-Dog Expandable Waterproof Smartphone GPS-Only Tracking Collar with 2-Second Update Rate, No Subscription Fee, Free Satellite Map : Pet Supplies Amazon.com: Dogtra Pathfinder TRX Additional Receiver 9-Mile 21-Dog Expandable Waterproof Smartphone GPS-Only Tracking Collar with 2-Second Update Rate, No Subscription Fee, Free Satellite Map : Pet Supplies](https://m.media-amazon.com/images/I/61iMqbq21ZL._AC_UF350,350_QL80_.jpg)
Amazon.com: Dogtra Pathfinder TRX Additional Receiver 9-Mile 21-Dog Expandable Waterproof Smartphone GPS-Only Tracking Collar with 2-Second Update Rate, No Subscription Fee, Free Satellite Map : Pet Supplies
![Amazon.com: Bousnic Dog Shock Collar with Remote - ¾ Mile Electronic Training Collar for (15-140lbs) Medium Large Dogs, Waterproof Rechargeable Dog E Collar with 3 Modes, Beep, Vibration, Safe Shock(1-16 Levels) : Amazon.com: Bousnic Dog Shock Collar with Remote - ¾ Mile Electronic Training Collar for (15-140lbs) Medium Large Dogs, Waterproof Rechargeable Dog E Collar with 3 Modes, Beep, Vibration, Safe Shock(1-16 Levels) :](https://m.media-amazon.com/images/I/719B3F6FltL.jpg)
Amazon.com: Bousnic Dog Shock Collar with Remote - ¾ Mile Electronic Training Collar for (15-140lbs) Medium Large Dogs, Waterproof Rechargeable Dog E Collar with 3 Modes, Beep, Vibration, Safe Shock(1-16 Levels) :
![Amazon.com : SportDOG Brand TEK Series 2.0 GPS Tracking Add-A-Dog Collar - Additional, Replacement, or Extra Tracking Collar - Waterproof and Rechargeable : Pet Supplies Amazon.com : SportDOG Brand TEK Series 2.0 GPS Tracking Add-A-Dog Collar - Additional, Replacement, or Extra Tracking Collar - Waterproof and Rechargeable : Pet Supplies](https://m.media-amazon.com/images/I/415tWqYYiRL._AC_.jpg)
Amazon.com : SportDOG Brand TEK Series 2.0 GPS Tracking Add-A-Dog Collar - Additional, Replacement, or Extra Tracking Collar - Waterproof and Rechargeable : Pet Supplies
![Amazon.com: Dogtra 2700T&B Long Range 1-Mile 1-Dog Training & Beeper Remote Dog Training E-Collar for Upland Gun Dog : Pet Supplies Amazon.com: Dogtra 2700T&B Long Range 1-Mile 1-Dog Training & Beeper Remote Dog Training E-Collar for Upland Gun Dog : Pet Supplies](https://m.media-amazon.com/images/I/711tZAz08ZL._AC_UF350,350_QL80_.jpg)
Amazon.com: Dogtra 2700T&B Long Range 1-Mile 1-Dog Training & Beeper Remote Dog Training E-Collar for Upland Gun Dog : Pet Supplies
![Amazon.com: Dogtra Pathfinder 9-Mile 21-Dog Expandable Waterproof Smartphone GPS Tracking & Training E-Collar with 2-Second Update Rate, No Subscription Fee, Free Satellite Map : Electronics Amazon.com: Dogtra Pathfinder 9-Mile 21-Dog Expandable Waterproof Smartphone GPS Tracking & Training E-Collar with 2-Second Update Rate, No Subscription Fee, Free Satellite Map : Electronics](https://m.media-amazon.com/images/I/61nQZSZn8SL.jpg)