The E-Collar PG-302 Pager Only 2 Dog System is a reliable and effective training tool for dogs of all sizes and breeds. With a range of 1/2 mile, this system allows you to communicate with your dogs from a distance. It is designed to fit all sizes and breeds, and can even be used for cats. The pager feature provides a gentle vibration that can be used as a cue for your pets. Whether you are training your dogs or simply need a way to communicate with them from a distance, the E-Collar PG-302 Pager Only 2 Dog System is a great choice.