Do you need to expand your dog’s boundary? The Ultra Wire Boundary Extension Kit gives you 500 feet of the special Ultra Wire, 50 brightly colored flags, and 10 solderless, waterproof wire connectors. This is hands down the best dog containment fence wire you will find anywhere.
Custom Engineered Ultra Wire:
- Special wire, custom engineered to give the ultimate pet containment system performance.
- Wire was created with electrical and mechanical specifications optimized for electronic dog fence applications.
- Made from the highest quality solid core copper with an extra thick, specially formulated insulating material that is especially resistant to ultraviolet sunlight, moisture, corrosion and stress.
- 40 percent thicker overall and about three times stronger that standard 18-gauge wire greatly reducing the risk of wire breaks.
- It provides the cleanest signal field, with much less risk of wire breaks.
- Guaranteed to last at least 20 years!
- Compare the new Ultra Wire to other wires:

- The red wire spool is standard 20 gauge wire; the green wire spool is standard 18 gauge wire.
- Each spool holds the same 500 foot length of wire.
- The fact that the Ultra wire is so much bigger illustrates how much thicker Ultra Wire is in overall diameter. This translates to higher strength, longer life, and less chance of wire breaks.
Take a look at the chart below to determine how many Ultra Wire Boundary Extension Kits you need.
