How It Works

Dog Guard Out of Sight Fencing is a concealed, electric fencing system. It uses a digital radio signal to keep your dog safe within your selected boundaries. This training tool works through a combination of professionally installed hardware and guided training from our trusted and caring Dog Guard dealers. The system works with three core components: the wire, transmitter, and receiver. Additional elements, like flags and training, will also help you get the most out of your system.

The Wire

Once you and your Dog Guard dealer work to identify the containment area, a wire will be installed underground to define the area’s perimeter. Your Dog Guard dealer will work with you to preserve the beauty of your landscape and property by installing the wire in the most unobtrusive and safe places on your property. Because the wire is mostly underground, it won’t hinder any human movement, making your yard safe for dogs and family members. The Dog Guard system can create a perimeter up to 50 acres, leaving plenty of room for your dog to roam. The system works just as well for smaller yards and some indoor systems require no wire at all. 

The Transmitter

There are two different kinds of transmitters for Dog Guard systems. Both options include the ability to set up a dual-zone, so if your dog crosses a specific boundary, they receive a warning correction and another full correction if they continue. The primary transmitter for your home’s exterior is the T-4 transmitter, which is used for primarily outdoor systems and comes with an AC adapter. The RT-2 Room Transmitter is designed for indoor use. The signal field radiates from the system at an equal distance in all directions. Both transmitters have a series of indicator lights that indicate the status of your Dog Guard system, allowing you to assess if your system is working properly.

A Dog Guard system is typically used to replace a less effective, more expensive or view-blocking fencing system.


When the field and transmitter are installed, your dog simply wears a Dog Guard receiver collar to complete the system. These receivers are available in varying sizes and strengths to make sure your dog has a comfortable fit and appropriate amount of correction to ensure maximum effectiveness.

There are four Dog Guard receiver models: The DG9XT Receiver is best for medium-to-stubborn and tough-to-train dogs, while the DG5 Receiver is for small-to-medium-sized dogs who tend to be more passive and timid. The DGM4 Receiver, a micro receiver, is for smaller dogs and the DGM4R Receiver is the rechargeable version of that model. 

All models have sturdy, water-resistant construction and an optional chew protector to protect your receiver and keep it in optimum condition. Their fail-safe operation means your receiver will shut down approximately 30 seconds after activation to prevent your dog from receiving continuous stimulation if accidentally caught in the system’s signal field. Your Dog Guard dealer will work with you to ensure that you and your dog get the receiver with the appropriate amount of correction.

Dog Guard underground electric fences can be used to contain a pet with a pre-existing fence. 

Flags & Training

In addition to providing expert installation services and instructions on using your Dog Guard system, your professional local dealer will help you train your dog. Your dealer’s understanding of your dog’s situation, breed and personality, paired with the knowledge of the system ensures that your dog receives customized training best suited for them. This veterinarian-approved system includes placing flags to mark the containment area and helps your dog understand that they should stay in their safe area. A system installation is not complete until you fully understand the system and your dog has been trained. 

Troubleshooting and Support 

If your system is not working and your dog is leaving the containment area, check its three main components: the wire, the transmitter, and the receiver. If you are still having problems with your system, after making the checks below, contact your local dealer for additional assistance. 

Dealers may charge a fee for onsite service calls after initial installation but please check with your local representative


  • Power Light: If the power light is not lit, this means the system is not receiving power. Make sure the transmitter switch is set to “on.” If the switch is on, but the transmitter is still not working:
    • Check all the connections. The power cord should be plugged into a Dog Guard-approved surge protector and into the transmitter.
    • Check the outlet with a known working device, like a radio or a lamp, to make sure the power outlet is functioning properly.
    • If the power light remains off after these checks, contact your local dealer.
  • Loop light: If this light is not lit, the loop might be broken and you should be hearing an audible alarm.
    • Check the loop wires to make sure they are firmly connected to the transmitter.
    • If all is connected properly but the light is still off, check for a wire break. Note any evidence of digging, landscaping or construction in areas where the wire is present.
    • If you find a wire break, we can send you a splice kit to repair it yourself, or you can call your local dealer for a professional repair.
  • Fault light: If this light is on, the system is not functioning properly and it may be accompanied by an audible alarm.
    • Call your local dealer to examine the system.


If the transmitter appears to be functioning normally, check the receiver collar to ensure it fits your dog properly. A loose-fitting collar or a low battery is the most common reason a dog leaves the containment area. If the collar fits comfortably, take the receiver collar off your dog and go outside to the line. Snap the buckle together and hold the collar by the snapped buckle. Hold the receiver about knee height (as if your dog were in it) with the posts pointing up. You should start hearing the tone 2-3 feet before the wire. If you have to get closer than that, adjust the Range Control setting on the transmitter. If there is still no signal, take out the battery for 30 seconds and replace it, or replace the old battery with a new one. If none of these checks fix the problem, contact your local dealer.

Dog Guard products are designed and assembled in the USA at our Home Office in Troy, NY. We take pride in creating high-quality, durable products that both dealers and customers can count on. We have had the pleasure of serving thousands of customers and helping hundreds of families start their own dealership business. 

*DOG GUARD® Out-Of-Sight Fencing® is a trademark of Sunward Electronics® and should not be confused with Invisible Fence® (InvisibleFence®). Invisible Fence® and Invisible Fencing® are registered trademarks of Invisible Fence Company.