For those worried about the wireless dog fence failing from low batteries or just looking for a way to save money, we have a few rechargeable dog fence systems to choose from. Even after your dog has adapted to his or her new boundaries, it does not mean they will not occasionally attempt to test this. This is why it is important that the receiver collar is not running on low battery power. In the event that the batteries die and your dog attempts to test the boundary limit, your four legged friend will no longer be safely confined. With a rechargeable dog fence, you will not have to worry about this. At the same time, you will be saving money by not having to buy batteries.