The Retrovox Stubborn Dog Underground Fence features the Stubborn Dog Collar – The most powerful collar available anywhere! This Stubborn Dog Fence Kit includes everything you need to contain one dog in a yard up to 500 sq metres. With additional wire and flags and dog fence collars, the Stubborn Dog Radio Fence can enclose yards up to 10 acres in size and contain an unlimited number of pets.
The PetSafe Stubborn Dog Collar has five levels of correction plus vibration in the warning area for an added deterrent and a low battery light to let you know when to replace the battery.