If you want to keep your dog in your yard and keep him from running away, then the Sport DOG Brand In-Ground Fence System is a simple and cost-effective alternative to the traditional dog containment system.
Safe and effective for all dogs over 10 pounds, the Sport DOG Brand In-Ground Fence System's transmitter is powerful enough to cover up to 100 acres of land. Installation is as simple as burying the wire around the perimeter of your yard and plugging in the transmitter.
Your dog wears a correction collar that receives a signal from the wire and warns him if he ventures too close to the perimeter. The waterproof collar receiver allows for four adjustable levels of correction plus tone and vibration mode. The system is expandable to include any number of dogs with the purchase of additional collar receivers. Follow the training instructions included with your Sport DOG Brand In-Ground Fence System to get your dog acquainted with his new boundaries and he will be staying safely in your yard in no time!
I bought this for a 200 lb English Mastiff. It seems well made and has clear instructions, though its pretty straight forward installation. I have it covering about 5 acres and it does a great job. I would say the only draw back is this unit is designed for larger coverage, but they only give you 1000 feet of wire. You can buy more wire and flags, but if you know folks are buying this to cover larger areas, why not give them what they need to do so? Overall that is not a problem though, since they plainly tell you up front.