Dogtra 2300NCP Extra Collar Introducing the perfect addition to your Dogtra 2300 Expandable system – the Dogtra 2300NCP Extra Collar. While the Dogtra 2300NCP Expandable comes initially as a 1-dog system, you can easily upgrade it to train two dogs simultaneously by adding this extra collar/receiver. This package includes a vibrant ORANGE strap, providing both […]