Keep your determined dog safe and secure during outdoor play without worry. The PetSafe® Stubborn Dog In-Ground Fence™ is a do-it-yourself weekend project for most yard shapes and sizes. In this kit you will receive 500 feet of wire to create up to a 1/3-acre area to keep your dog safe and secure. With the purchase of additional wire, you can contain up to a 25-acre yard. This in-ground fence comes with 1 PetSafe® Stubborn Dog In-Ground Fence™ Receiver Collar that fits dogs who weigh 8 pounds or more and adjusts to fit neck sizes between 6-28 inches. The waterproof, battery-operated collar has a tone plus vibration mode and 4 levels of adjustable static correction at a higher intensity correction level for hard-to-train pets. This system includes a unique run-through prevention to help keep your dog from running through their set boundary. If they attempt to run through, the static correction level will increase to encourage your dog to stay inside their safe play space. If you have more than 1 pet at home, simply purchase as many additional compatible receiver collars as you need so all of your pets can use the same system. With just 2 short weeks of training, your best friend will enjoy roaming and exploring their new yard! PetSafe® brand is here to help you and your pet live happy together™.