The PetSafe PIF-300-11 Wireless Pet Containment System offers a convenient solution that, unlike other wireless fences, requires no buried wires (i.e. digging) or complicated setup.
You simply plug it in, strap the collar on the dog and your good to go. If your pet breaches the 90-foot radius from the Petsafe base station, a small electric shock and tone is sent to the collar, where the pet should return to his set perimeter.
It includes some visual aids (flags) to let your pet know their limits. It is also fairly portable, so taking it to another house is fairly simple.
You can purchase the PetSafe PIF-300-11 Wireless Pet Containment System for $280 at Amazon.