Last week Chris and I bought a PetSafe Wireless Fence for Bentley. If any of you have ever heard of Ivan Pavlov, the wireless fence follows his theory.
Ivan Pavlov was a psychologist during the late 1800's and early 1900's. He did a study on how dogs would hear a bell see the food and begin to salavate. Over time he could just ring the bell and the dog would begin to salavate immedatly without seeing the food because he (beign the dog) expected it.
The PetSafe wireless fence follows the same idea. You plug up the tower in your house and it puts out a signal to the collar, which is on the dog, and it beeps once and the farther out of range the collar gets it beeps faster until it is out of reach then the collar sends out a stimulating shock which startles the dog and causes them to retun back to their "safe zone."
This system has been a great thing for Chris and myself and Bentley. Bentley has responded so well to system I would totally recommend it. The first tower that we got had some kind of error in the unit. I called the company and explained what was going on and they were so helpful and kind. They sent us a new unit and we have had no problems since.