Accessories for underground dog fence systemsAdd more wire and flags to extend your boundariesBoundary Kit has 500 ft 20-gauge wire and 50 training flags. If you need extra training flags, purchase the 50 plastic Additional Training Flags.FasTrak Twisted Wire Kit gives you pre-twisted wire areas where your dog can cross safely over buried wire; connects to transmitter and off-limits zones. 100 ft 20-gauge. -->You will not need extra wire if your yard is 1/4 acre or less than 10,000 sq ft (approx 100 x 100 ft). If your yard exceeds that size or if you have "pet-free" areas to zone, you will need to purchase additional kits. Replacement batteries also available.Please click on "More Information" for details on how to determine your kit/wire needs based upon the area you intend to fence.

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