The PetSafe Stubborn Dog In-Ground Fence provides a safe and effective way to keep your persistent pup contained within a custom-shaped boundary. This in-ground fence system is designed for dogs 8 lbs and up. It offers a reliable solution for pet owners seeking to establish boundaries without the need for a physical fence. The kit includes everything needed to contain one dog, featuring 500 feet of wire, boundary flags, a surge protector, and a receiver collar. The collar is lightweight and adjustable, ensuring a comfortable fit for your dog. The system works by delivering a static correction when your dog approaches the established boundary. Key features of the PetSafe Stubborn Dog In-Ground Fence: * **Adjustable levels of correction:** Offers multiple levels of static correction, including the highest intensity available for stubborn dogs. * **Expandable coverage:** The system can be expanded up to 25 acres with the purchase of additional wire, allowing you to customize the size of the containment area. * **Includes essential components:** Comes complete with 500 feet of wire, a receiver collar, a 9V battery, a surge protector, and training flags. * **Tone and vibration mode:** Offers tone and vibration options in addition to static correction for training. * **Anti-Linger Prevention:** Helps prevent your dog from lingering in the warning zone.