Dual Collar Electric Dog Fence System with 1.2 Acre Range SafeDual Collar Electric Dog Fence System with 1. 2 Acre Range Safe Keep your dog safely within your yard without building a physical fence. This electric dog fence system uses a buried wire to create a clear boundary for your pet. When your dog approaches the limit, the collar gives a warning sound first. If your dog continues forward, a mild correction follows to guide them back. The system is designed to help dogs learn their safe space over time. It