The original collar for the SportDOG Brand® FieldSentinel™ Series with BodyGuard™ technology – the world’s first e-collars with health alerts. Only compatible with FieldSentinel remote trainers. Add another dog to your current training and health monitoring system or replace a collar with the FS-AD Add-A-Dog Collar.

The collar that comes with the FieldSentinel™ system is default paired to Dog 1 (toggle switch up).
For the use of 2 dogs, the additional collar will need to be paired.

This FieldSentinel™ 825/1825 Add-A-Dog® collar is only compatible with the FieldSentinel Series:

FieldSentinel™ 825
FieldSentinel™ 1825