Sportdog Extra collar for the SDF 100 For use with SDF-100 In-Ground Fence System. Provides four adjustable correction levels plus beep and vibrate-only modes. Includes two sets of contact points to match the length of your dog's coat. Waterproof. Sized for dogs over 10 pounds. An unlimited number of dogs can be added to the SDF-100 system. Regularly: $109.95 On Sale: $99.95

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Upgrade ANY Pet Containment System offered on MyGoodPuppy.com to 18-Gauge Heavy Duty Boundary Wire AND Heavy Duty 18-Gauge Pre-twisted Wire for larger boundary areas for improved signal strength, rocky soil or above ground installations. Our Heavy Duty 18-Gauge wire is not only thicker on the wire but it also features a heavier coating which is twice as thick as the standard 18-gauge wire.

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